| 单词 | zygote |
| 例句 | The app used words like zygote and blastocyst, which were not Pokémon names but developmental stages where brain stems or cell clusters form what would eventually become ears, kneecaps, nostrils, toes, lips and everything else. The Internet Thinks I’m Still Pregnant 2016-09-02T04:00:00Z I believed that a zygote is not a person, and a four-week-old clump of cells is a precursor to human life. Disneyland with my invisible guest 2019-01-12T05:00:00Z She say, “Male gamete, I surmise: We’ll become a zygote if we just fraternize.” Style Invitational Week 1239: MASH 3 — combine two movie titles 2017-08-03T04:00:00Z There have been so many of these literary zygotes I have lost count. Has any author's reputation fallen further or faster than Dostoevsky's? 2010-09-24T15:14:00Z "You're going to change our lives, baby," I teased the zygote as we lay like beached whales on the couch in our New Orleans living room. The show I never wanted to watch, until I had to 2011-04-29T18:20:00Z "No – in fact he's pretty much been doing this exact same material since you were a zygote," I was tempted to reply, but didn't want to destroy the magic. Standup for kids is not child's play 2011-08-16T11:54:11Z Nor will it stop there, as some seek to include within their orbit certain animals, zygotes, fetuses and the brain-dead. Atheism’s radical new heroes: Richard Dawkins, Sam Harris and an evolving new moral view 2014-03-02T17:00:00Z “A zygote like a tiny question mark drifts into her womb,” Mr. Doerr writes silkily about one failed effort for Imogene to conceive. Books of The Times: Anthony Doerr?s ?Memory Wall,? Fleeting Yesterdays 2010-07-28T22:07:00Z Since Rachel and Alvy only ever feel like constructs, not characters, it’s predictable that their attitudes would reverse once their zygote is encased in egg-shaped plastic. Review: On the future of childbirth, 'The Pod Generation' plays it as safe as a helicopter parent 2023-08-11T04:00:00Z This is strikingly apparent in the development of a new organism—a human being, say—from a single fertilized egg, or zygote. Synthetic Morphology Lets Scientists Create New Life-Forms 2023-05-31T04:00:00Z When the n + 1 gamete fuses with a normal gamete, the resulting zygote has 2n + 1 chromosomes. Fundamentals of Biology 2015-01-01T00:00:00Z The process by which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well regulated. Concepts of Biology 2013-04-25T00:00:00Z The word ‘fetus’ refers to a specific gestational stage of development, as opposed to the zygote, blastocyst, or embryo stages. Opinion | The worst federal judge in America now has a name 2023-04-08T04:00:00Z Mostly, this is because I know how damaging abortion can be for many women, not all, especially once they have a baby and realize that he or she was once also a mere zygote. Opinion | Women who have abortions may be headed to prison — or worse 2023-03-17T04:00:00Z Yes, all the zygote seems to get by way of instruction is a genome, but you will look there in vain for any blueprint for a heart or brain. Synthetic Morphology Lets Scientists Create New Life-Forms 2023-05-31T04:00:00Z The zygote undergoes mitosis without cytokinesis, resulting in a single-celled, multinucleate mass visible to the naked eye. Fundamentals of Biology 2015-01-01T00:00:00Z Thickening of the endometrium prepares the uterus to receive the fertilized egg or zygote, which will then implant itself in the endometrium. Concepts of Biology 2013-04-25T00:00:00Z Stacey Freeman was arrested and imprisoned to protect her "unborn child" from the possibility of her using drugs or alcohol that might "endanger" the zygote or fetus. Republicans and billionaires are selling Americans a deadly caricature of "freedom" 2022-11-27T05:00:00Z Typically during reproduction, two gametes — cells with half the number of original chromosomes — come together to create a zygote, with a full suite of genes. Cracking the Case of the Giant Fern Genome 2022-09-12T04:00:00Z And while different traditions may have different views, my view is just as a sperm or a zygote, it’s not yet a person. Meet the woman who started an underground abortion network in the 1960s 2022-08-23T04:00:00Z The cellular slime mold sexual life cycle begins when solitary amoebas undergo fertilization, resulting in a 2n zygote. Fundamentals of Biology 2015-01-01T00:00:00Z One sperm and the egg combine, forming a diploid zygote—the future embryo. Concepts of Biology 2013-04-25T00:00:00Z The diploid zygote can then complete the sexual segment of the life cycle through meiosis. Biology for AP Courses 2022-06-09T00:00:00Z But when these gametes first form, it may be that pairs of chromosomes do not fully separate, leading to a zygote with a genome that is twice as large as its parents’. Cracking the Case of the Giant Fern Genome 2022-09-12T04:00:00Z This soul as the real self solves the ship of Theseus dilemma, as the soul continuously exists from zygote or infant and is not replaced by basic building materials. Introduction to Philosophy 2022-06-15T00:00:00Z The zygote undergoes mitosis and meiosis, resulting in more 1 n solitary amoebas. Fundamentals of Biology 2015-01-01T00:00:00Z Monosomic human zygotes missing any one copy of an autosome invariably fail to develop to birth because they have only one copy of essential genes. Concepts of Biology 2013-04-25T00:00:00Z The zygote nucleus contains the genetic information to produce a new individual. Biology for AP Courses 2022-06-09T00:00:00Z The zygote, or the fertilized egg, is totipotent because it is the single cell that is able to develop into any type of cell in the body. Miller & Levine Biology 2018-01-01T00:00:00Z The purpose, or ergon, of both the acorn and the oak tree are present in the zygote, the cell that forms when male and female sex cells combine. Introduction to Philosophy 2022-06-15T00:00:00Z Therefore, both gametes and zygotes must be protected from desiccation. Fundamentals of Biology 2015-01-01T00:00:00Z On fertilization, the zygote will give rise to the embryo, which is enclosed in a seed coat of tissue from the parent plant. Concepts of Biology 2013-04-25T00:00:00Z For instance, fertilization of an abnormal diploid egg with a normal haploid sperm would yield a triploid zygote. Biology for AP Courses 2022-06-09T00:00:00Z Human development begins as a zygote, then after a few cell divisions, the embryo is formed. Miller & Levine Biology 2018-01-01T00:00:00Z This zygote cell contains the genetic material, or the instructions, for how the organism will develop to carry out its intended purpose. Introduction to Philosophy 2022-06-15T00:00:00Z The gametophyte produces gametes, two of which fuse to form a diploid zygote. Fundamentals of Biology 2015-01-01T00:00:00Z The resulting cell, or zygote, is then diploid and contains two sets of chromosomes. Concepts of Biology 2013-04-25T00:00:00Z Polyploid animals are sterile because meiosis cannot proceed normally and instead produces mostly aneuploid daughter cells that cannot yield viable zygotes. Biology for AP Courses 2022-06-09T00:00:00Z The pollen tube grows into the style, eventually reaching the ovary and entering an ovule, resulting in double fertilization, where a diploid zygote and endosperm are produced. Miller & Levine Biology 2018-01-01T00:00:00Z Similarly, as our bodies develop from zygote to adult, cells die and are replaced using new building materials we obtain though food, water, and our environment. Introduction to Philosophy 2022-06-15T00:00:00Z After fertilization, the zygote develops into a blastula, which develops into a planula larva. Fundamentals of Biology 2015-01-01T00:00:00Z The zygote develops into an embryo with a radicle, or small root, and one or two leaf-like organs called cotyledons. Concepts of Biology 2013-04-25T00:00:00Z If the editing is done with zygote- forming cells, the change is inherited. Biology for AP Courses 2022-06-09T00:00:00Z Through development, the zygote forms a hollow ball of cells, and then folds in on itself, elongating into a tube, which becomes the digestive tract. Miller & Levine Biology 2018-01-01T00:00:00Z This new single cell, called a zygote, contains all of the genetic material needed to form a human—half from the mother and half from the father. Anatomy and Physiology 2013-06-19T00:00:00Z The illustration shows the life cycle of a jellyfish, which begins when sperm fertilizes an egg, forming a zygote. Fundamentals of Biology 2015-01-01T00:00:00Z Each box then represents the diploid genotype of a zygote, or fertilized egg. Concepts of Biology 2013-04-25T00:00:00Z A postzygotic barrier occurs after zygote formation; this includes organisms that don’t survive the embryonic stage and those that are born sterile. Biology for AP Courses 2022-06-09T00:00:00Z The inner cells are pluripotent because they can develop into any of the cell types of the body, but they cannot form the tissues surrounding the embryo like the totipotent zygote. Miller & Levine Biology 2018-01-01T00:00:00Z The answer lies, of course, in the DNA in the sperm and oocyte that combined to produce that first diploid cell, the human zygote. Anatomy and Physiology 2013-06-19T00:00:00Z The zygote divides and grows into a planula larva, which looks like a swimming millipede. Fundamentals of Biology 2015-01-01T00:00:00Z Finally, both gametes and zygotes must be protected from drying out. Concepts of Biology 2013-04-25T00:00:00Z When fertilization takes place and a zygote forms, postzygotic barriers can prevent reproduction. Biology for AP Courses 2022-06-09T00:00:00Z During fertilization, a sperm and egg fuse with each other, producing a diploid zygote. Miller & Levine Biology 2018-01-01T00:00:00Z The fertilized egg cell, or zygote, starts dividing to generate the cells that make up an entire organism. Anatomy and Physiology 2013-06-19T00:00:00Z After fertilization, the zygote matures and grows into a sporophyte, which in turn will form sporangia or “spore vessels.” Fundamentals of Biology 2015-01-01T00:00:00Z Fertilization and fusion of the gamete nuclei produce a zygote. Concepts of Biology 2013-04-25T00:00:00Z Two species of insects mate, but the zygote does not survive. Biology for AP Courses 2022-06-09T00:00:00Z The zygote develops into a new sporophyte, and the cycle begins again. Miller & Levine Biology 2018-01-01T00:00:00Z After fertilization the zygote gives rise to rapid mitotic cycles, generating many cells to form the embryo. Anatomy and Physiology 2013-06-19T00:00:00Z Fusion of the male and females gametes forms the diploid zygote, which develops into the sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z With fusion, the cell is known as a zygote. Concepts of Biology 2013-04-25T00:00:00Z During cleavage, the cells divide without an increase in mass; that is, one large single-celled zygote divides into multiple smaller cells. Biology for AP Courses 2022-06-09T00:00:00Z Sperm are produced in antheridia and need standing water to swim to the eggs to form a diploid zygote. Miller & Levine Biology 2018-01-01T00:00:00Z The zygote is described as totipotent because it ultimately gives rise to all the cells in your body including the highly specialized cells of your nervous system. Anatomy and Physiology 2013-06-19T00:00:00Z The life cycle begins with the fusion of egg and sperm to form a zygote. Fundamentals of Biology 2015-01-01T00:00:00Z The zygote initiates cleavage and the developing embryo travels through the oviduct to the uterus. Concepts of Biology 2013-04-25T00:00:00Z Sperm are obtained from the man and they are combined with the eggs and supported through several cell divisions to ensure viability of the zygotes. Biology for AP Courses 2022-06-09T00:00:00Z This zygote grows into a sporophyte, capped by a sporangium. Miller & Levine Biology 2018-01-01T00:00:00Z This is critical because if more than one sperm were to fertilize the oocyte, the resulting zygote would be a triploid organism with three sets of chromosomes. Anatomy and Physiology 2013-06-19T00:00:00Z Once fertilization is complete, the resulting diploid zygote develops into the embryo, and the fertilized ovule forms the other tissues of the seed. Fundamentals of Biology 2015-01-01T00:00:00Z The Supreme Court of the United States now in effect holds that corporations and zygotes are persons, but women are not. Seven days in June: A coup more effective than Donald Trump's 2022-07-09T04:00:00Z If it fuses with a sperm, the resulting zygote enters the cervix for implantation. Biology for AP Courses 2022-06-09T00:00:00Z The diploid zygote produced by fertilization develops into a new sporophyte plant, and the cycle begins again. Miller & Levine Biology 2018-01-01T00:00:00Z Fertilization is complete upon unification of the haploid nuclei of the two gametes, producing a diploid zygote. Anatomy and Physiology 2013-06-19T00:00:00Z The zygote, protected by the archegonium, divides and grows into a sporophyte, still attached by its foot to the gametophyte. Fundamentals of Biology 2015-01-01T00:00:00Z But many anti-abortion activists say it begins when a sperm and egg unite to form a zygote, which can happen several days earlier. New Abortion Laws Could Make Prenatal Genetic Screening Harder to Do 2022-06-27T04:00:00Z If it fuses with a sperm, the resulting zygote enters the uterus for implantation. Biology for AP Courses 2022-06-09T00:00:00Z After fertilization, the zygote contained within a seed grows into a tiny plant. Miller & Levine Biology 2018-01-01T00:00:00Z If the oocyte is successfully fertilized, the resulting zygote will begin to divide into two cells, then four, and so on, as it makes its way through the uterine tube and into the uterus. Anatomy and Physiology 2013-06-19T00:00:00Z The newly formed zygote grows into a sporophyte that emerges from the gametophyte and grows by mitosis into the next generation sporophyte. Fundamentals of Biology 2015-01-01T00:00:00Z The obvious result of calling abortion “homicide” is that the “womb” will not have rights superior to those of the zygote. Opinion | This antiabortion argument forgot that women are people too 2022-06-10T04:00:00Z If it fuses with a sperm, the resulting zygote enters the uterus for implantation. Biology for AP Courses 2022-06-09T00:00:00Z Fertilization produces a diploid zygote, which grows into an embryo that is encased to form a seed. Miller & Levine Biology 2018-01-01T00:00:00Z If fertilization has occurred, this fluid will nourish the ball of cells now developing from the zygote. Anatomy and Physiology 2013-06-19T00:00:00Z The egg, and later, the zygote, form in a protected chamber on the parent plant. Fundamentals of Biology 2015-01-01T00:00:00Z When should a zygote, an embryo or even a fetus be acknowledged as a human being? Why is the Supreme Court using religious belief to alter secular law? 2022-05-10T04:00:00Z If it fuses with a sperm, the resulting zygote enters the cervix for implantation. Biology for AP Courses 2022-06-09T00:00:00Z There’s another called “The Biochemist,” where I’m having all these ideas, talking about the zygote, mitosis and meiosis. RZA on the current state of hip-hop: ‘The wisdom is missing’ 2022-04-05T04:00:00Z Thus, the ovum can be thought of as a brief, transitional, haploid stage between the diploid oocyte and diploid zygote. Anatomy and Physiology 2013-06-19T00:00:00Z The zygote grows into a small sporophyte still attached to the parent gametophyte. Fundamentals of Biology 2015-01-01T00:00:00Z That simple reality pretty much proves the cynicism of Alito's charge that the state must be able to step in with the force of guns and prison bars to "protect" a zygote or fetus. Why is the Supreme Court using religious belief to alter secular law? 2022-05-10T04:00:00Z The zygote might have multiple sets of chromosomes. Biology for AP Courses 2022-06-09T00:00:00Z The first of these stages is fertilization in the egg duct, when a zygote is formed with the full human genetic material. When human life begins is a question of politics — not biology 2021-09-07T04:00:00Z The larger amount of cytoplasm contained in the female gamete is used to supply the developing zygote with nutrients during the period between fertilization and implantation into the uterus. Anatomy and Physiology 2013-06-19T00:00:00Z The zygote develops into a long and slender sporophyte that eventually splits open, releasing spores. Fundamentals of Biology 2015-01-01T00:00:00Z That the single zygote cell formed when a microscopic sperm cell fertilizes an ovum is as much a person as you and me. Opinion | The party of McConnell, in the age of Trump, stands for nothing 2020-09-22T04:00:00Z The zygote might possess multiple sets of chromosomes, which will result in a neural tube defect in the developing fetus. Biology for AP Courses 2022-06-09T00:00:00Z Whether it can be developmentally labeled as a zygote, an embryo or a fetus, it is scientifically, biologically distinct from the woman who carries it. Opinion | Why those who oppose abortion continue to fight 2020-01-24T05:00:00Z The totipotent stem cell is the zygote, or fertilized egg. Anatomy and Physiology 2013-06-19T00:00:00Z Three cell divisions transform the single-celled zygote into an eight-celled structure. Fundamentals of Biology 2015-01-01T00:00:00Z As a former zygote myself, I understand the principle. Opinion | The party of McConnell, in the age of Trump, stands for nothing 2020-09-22T04:00:00Z The zygote would be viable, but the resulting embryo would be genetically inviable. Biology for AP Courses 2022-06-09T00:00:00Z "Hosts of signals happen as those cells become a zygote," says epigeneticist Tracy Bale at the University of Maryland in Baltimore. Parents’ emotional trauma may change their children’s biology. Studies in mice show how 2019-07-18T04:00:00Z The mucopolysaccharides then coat the nascent zygote in an impenetrable barrier that, together with hardened zona pellucida, is called a fertilization membrane. Anatomy and Physiology 2013-06-19T00:00:00Z The left part of the illustration shows a single-celled zygote. Fundamentals of Biology 2015-01-01T00:00:00Z “Overturning Roe v. Wade,” as the campaign shorthand goes, would compromise the rights of every woman with a zygote in her body. Opinion | The party of McConnell, in the age of Trump, stands for nothing 2020-09-22T04:00:00Z What determines whether a zygote will undergo total or partial cleavage? Biology for AP Courses 2022-06-09T00:00:00Z “There is nothing potential about the life of the fetus, the embryo, or the zygote: it is actually alive,” Tollefsen wrote in a 2010 journal article. Mike Pompeo's "pro-women" human rights panel is loaded with abortion foes 2019-07-12T04:00:00Z This step completes the process of fertilization and results in a single-celled diploid zygote with all the genetic instructions it needs to develop into a human. Anatomy and Physiology 2013-06-19T00:00:00Z After fertilization of the egg, the diploid zygote is formed, which divides by mitosis to form the embryo. Fundamentals of Biology 2015-01-01T00:00:00Z “When asked why the bill doesn’t bestow personhood on the thousands of zygotes in fertility clinics, he said the quiet part loud. ‘The egg in the lab doesn’t apply. Samantha Bee: abortion bills are 'designed to oppress and control' 2019-05-16T04:00:00Z After the zygote multiplies to form a mass of cells, what is the chromosome number of each cell? Biology for AP Courses 2022-06-09T00:00:00Z I understand why those who hold that belief would wish to invest the zygote, embryo and then fetus with “personhood,” while working assiduously to conceal the religious tenets that undergird their quest. Opinion | Treating a Fetus as a Person 2019-01-05T05:00:00Z Much less commonly, a zygote can divide into two separate offspring during early development. Anatomy and Physiology 2013-06-19T00:00:00Z This process produces a diploid fertilized egg called a zygote. Fundamentals of Biology 2015-01-01T00:00:00Z “For these and other reasons, the whole notion of simply recovering ancient DNA and plugging it into living cells to generate zygotes is profoundly impractical,” he said. A ‘Time Capsule’ for Scientists, Courtesy of Peter the Great 2018-11-12T05:00:00Z Why are the diploid zygotes produced after fertilization of sperm cells produced by spermatogenesis not similar? Biology for AP Courses 2022-06-09T00:00:00Z Chan injected sperm cells from each batch into eggs from a nonstressed female, then implanted the fertilized eggs—zygotes—into the same foster mom. How Dad's Stresses Get Passed Along to Offspring 2018-11-08T05:00:00Z Still, she already has responsibilities to her three zygotes. America's hottest export? Sperm 2018-08-15T04:00:00Z When a fertilized egg — known as a zygote — starts dividing in the womb, many of its early descendant cells end up with the wrong number of chromosomes. Every Cell in Your Body Has the Same DNA. Except It Doesn’t. 2018-05-21T04:00:00Z The forms suggest zygotes and planets, as well as eyes, but at the heart of each of the larger circles is a leafy motif. Review | In the galleries: ‘Interact + Integrate’ requires audience participation 2018-05-03T04:00:00Z The implanted zygote will not be able to derive sufficient nutrition from the endometrium. Biology for AP Courses 2022-06-09T00:00:00Z Regions showing paternal open chromatin and H3K4me3 in zygotes are shaded. Chromatin analysis in human early development reveals epigenetic transition during ZGA 2018-05-01T04:00:00Z The team injected the molecular machinery needed for CRISPR–Cas9 gene editing when the fertilized eggs, or zygotes, consisted of just one cell and then followed their development in the lab for a week. CRISPR used to peer into human embryos' first days 2017-09-19T04:00:00Z “The same zygote would never develop exactly the same way twice,” said Dr. Walsh. Every Cell in Your Body Has the Same DNA. Except It Doesn’t. 2018-05-21T04:00:00Z In our studies with human oocytes and zygotes, we used purified recombinant Cas9 protein instead of plasmid, which may enhance the specificity while shortening enzymatic exposure time, thereby diminishing off-site targeting. Correction of a pathogenic gene mutation in human embryos : Nature : Nature Research 2017-08-01T04:00:00Z Even if fertilization is successful, the zygote may not be able to implant successfully. Biology for AP Courses 2022-06-09T00:00:00Z A random set of peaks that match the lengths and number of zygote maternal peaks was used as a control. Chromatin analysis in human early development reveals epigenetic transition during ZGA 2018-05-01T04:00:00Z At the time of its birth, the zoo explained that the turtles suffered from a condition called polycephaly, a condition that results when zygotes don't properly separate during development. Two-Headed Baby Turtle Swims to Sea—Will It Survive? 2017-08-21T04:00:00Z Symmetrical conjoined twins, such as this porpoise, are thought to result when two separate embryos fuse together or a zygote only partially splits. Two-Headed Porpoise Found For First Time 2017-06-14T04:00:00Z We next evaluated targeting outcomes in human zygotes produced by fertilizing healthy donor oocytes with sperm from the patient heterozygous for the MYBPC3 mutation. Correction of a pathogenic gene mutation in human embryos : Nature : Nature Research 2017-08-01T04:00:00Z Even if fertilization is successful, the zygote may not be able to implant successfully. Biology for AP Courses 2022-06-09T00:00:00Z He twice co-sponsored bills to establish that the Constitution protects the rights of zygotes from the moment of fertilization. The crazy, headlong rush to repeal Obamacare 2017-03-09T05:00:00Z If you were concerned that forced funerals for fetuses and zygotes wasn’t quite horrific enough, rejoice! Will Trump cause progressives to forget about women's rights? | Jessica Valenti 2016-12-15T05:00:00Z Many animals have it; zygotes and embryos don’t. If Animals Have Rights, Should Robots? 2016-11-20T05:00:00Z Given the choice between a dead woman and a dead zygote, they’ll opt for the dead woman six times out of ten. Just like the Wizard of Oz, Donald Trump has no magic powers 2016-11-11T05:00:00Z Fusion of the gametes gives rise to a fertilized egg cell, or zygote. Biology for AP Courses 2022-06-09T00:00:00Z “Nature is a terrible obstetrician,” he said, referring to the “continuum” of pregnancy and birth: the large number of zygotes that never implant, the 75 percent lost before 20 weeks, and stillbirth. Should pregnant women be induced at 39 weeks? 2016-06-27T04:00:00Z I prefer the overlooked and enigmatic, the washed away detritus or unformed golfing zygotes lingering in the corners of professional golf. My U.S. Open prediction: Pain and a return from obscurity - Golf Digest 2016-06-14T04:00:00Z The bill and the debate around it is a veritable smorgasbord of right-wing nuttiness, starting with the apparent belief that zygotes are industrious workers who can feel happiness and own things. Missouri’s racist rape trolls: State GOP introduces horrendous anti-choice bill — complete with an unforgivable affront to rape victims 2016-05-06T04:00:00Z Of course that’ll never happen because laws like HB 1337 are as much about oppressing women as they are about rescuing every zygote. While America is distracted by the Trump, Indiana just passed one of the most restrictive abortion bills in the nation 2016-03-14T04:00:00Z The germ cells are generated early in the development of the zygote. Biology for AP Courses 2022-06-09T00:00:00Z What if the zygote in my mother’s womb never split? What If My Life Had Taken a Different Turn? 2015-10-15T04:00:00Z Anti-choice ideology is founded on the belief that a single-celled zygote possesses a supernatural appendage called a soul that makes it the moral equal of an adult human. Abortion opposition is a religious stance. Atheists must help fight for choice | Adam Lee 2015-10-05T04:00:00Z As a reminder, this is what a zygote looks like. Missouri’s racist rape trolls: State GOP introduces horrendous anti-choice bill — complete with an unforgivable affront to rape victims 2016-05-06T04:00:00Z Measures to give zygotes personhood rights have failed again and again, the majority of Americans don’t want to see Roe v Wade overturned, and most people believe in abortion exceptions. Anti-abortion one-upsmanship will haunt Republicans in the election | Jessica Valenti 2015-08-19T04:00:00Z The zygote immediately undergoes meiosis to form four haploid cells called spores. Biology for AP Courses 2022-06-09T00:00:00Z Most people think of a zygote as something different from a child. Planned Parenthood video shows an appalling trivialization of life 2015-07-16T04:00:00Z At the moment that a sperm penetrates an egg, that single-cell zygote is what is known as totipotent: It is pure potential. The Mixed-Up Brothers of Bogotá 2015-07-09T04:00:00Z The researchers used abnormal zygotes that would otherwise be discarded, “because ethical concerns preclude studies of gene editing in normal embryos,” they write. Chinese paper on embryo engineering splits scientific community 2015-04-24T04:00:00Z No person actually imagines that a zygote is a person. Arguing Abortion 2014-11-28T05:00:00Z Fertilization between the gametes forms a diploid zygote. Biology for AP Courses 2022-06-09T00:00:00Z I gave a date nine months before I was born, “December 30, 1962, 6 .,” when I was, what—a zygote?—but the box gave me nothing, neither visual nor audio. T. Coraghessan Boyle: “The Relive Box.” 2014-03-10T04:00:00Z I'm 100% sure that a technology will eventually exist for people to evaluate their embryos or zygotes for quantitative traits, like height or intelligence. Ethics: Taboo genetics 2013-10-02T17:20:38.167Z This allows the cells to create a new zygote that is capable of forming all cell types. Stem cells: Egg engineers 2013-08-21T17:50:20.380Z C. nivalis zygotes are quite red, so as melting, erosion, or evaporation concentrates algae at the surface, the snow blushes. Wonderful Things: Don't Eat the Pink Snow 2013-07-09T16:45:00.647Z The zygote will undergo multiple rounds of mitosis to produce a multicellular offspring. Biology for AP Courses 2022-06-09T00:00:00Z In animals, the resulting diploid cell — a zygote — goes on to divide asexually many times, forming the multicellular organism. Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z Also, at that stage, it’s a zygote, not an embryo — let alone a “person.” Organic Eden Foods’ quiet right-wing agenda 2013-04-11T11:45:00Z Abortion politics also had a role: although the pill is thought to act by preventing or delaying ovulation, it might also prevent implantation of a fertilized zygote. Time for plan B 2013-04-10T17:20:04.657Z One of these algae, Chloromonas brevispina, makes green zygotes and usually live in areas exposed to considerably less ultraviolet light than their red kin. Wonderful Things: Don't Eat the Pink Snow 2013-07-09T16:45:00.647Z The zygote will undergo many rounds of mitosis and give rise to a diploid multicellular plant called a sporophyte. Biology for AP Courses 2022-06-09T00:00:00Z What if, instead of dividing asexually through mitosis as an animal zygote does, the resulting zygote immediately underwent meiosis? Mosses Make Two Different Plants From the Same Genome, and a Single Gene Can Make the Difference 2013-05-12T19:45:00.233Z For a zygote’s worth much more than you. Best of the Salon limerick contest 2013-04-07T15:00:00Z “Personhood” bills have been introduced in Oklahoma and Mississippi, which would extend legal protection to zygotes. Abortion laws in the South: Cutting away at Roe v Wade 2013-03-14T16:06:58Z Like the carotenoids found in fruits and vegetables, the chemicals also lend zygotes an orange, red or rusty hue under the microscope. Wonderful Things: Don't Eat the Pink Snow 2013-07-09T16:45:00.647Z Monosomic human zygotes missing any one copy of an autosome invariably fail to develop to birth because they lack essential genes. Biology for AP Courses 2022-06-09T00:00:00Z That compared with an abnormality rate of just an eighth in control zygotes grown from untransplanted, healthy eggs. Gene therapy: Hello mothers, hello father 2012-10-25T15:00:58Z For a zygote’s worth much more than you. Salon limerick contest 2012-08-20T14:25:00Z Even more embarrassing, when the technician applied donor sperm to Sierra’s eggs, and Liam’s sperm to donor eggs, zygotes formed and started cleaving. UGS (Universal Genome Sequencing) in the Mid-21st Century 2012-06-09T18:45:02.963Z After a period of rest each zygote, through a series of cell-divisions, develops into an adult Volvox. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The resulting coupled cell or zygote divides into two, which again encyst. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z In 1868, German biologist Ernst Haeckel first used the term 'stem cell' to describe a zygote. Stem Cells: Flexible friends 2012-02-29T18:21:27.080Z The actual conjugation is quite similar to the process in Coccidia, and the resulting zygote perfectly homologous. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z The two conjugating elements unite completely, cytoplasm with cytoplasm and nucleus with nucleus, to form the definitive sporoblast or zygote. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 5 "Greek Law" to "Ground-Squirrel" 2011-12-05T03:00:51.527Z Cleavage of the Egg.—It is through a series of such divisions as these that the zygote or fertilized egg-cell builds up the tissues and organs of the new organism. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z Kiessling and her supporters have decided to drive a truck into that legal wording, and declare all zygotes "persons." Mississippi's Choice: Personhood and the Rights of Zygotes 2011-10-20T09:00:00Z In the zygote resulting from pairing two nuclei soon fuse into one; but this again divides into two; an embryonic shell is secreted, and this is the microspheric type, which is multinuclear from the first. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 6 "Foraminifera" to "Fox, Edward" 2011-04-22T02:00:08.637Z The result in either case is a “zygote,” a cell formed by fusion of two which divides in the usual way to produce new individuals. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z To some, you might as well kill a newborn as use a pill that prevents a zygote -- a fertilized egg smaller than a grain of salt -- from attaching to the uterus. Republicans Hug Big Government in Abortion Fight: Ann Woolner 2011-02-11T02:36:09Z But there is reason to suppose that identical twins in reality come from the same zygote. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z As in the case of so many other forms of matter, the more important properties of the zygote do not become apparent until it is submitted to the action of external forces. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Was it better than reverting past the embryo to the simple lifeless zygote? A Feast of Demons IX, X, show the formation of the zygote by fusion of the nuclei of the gametes. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" But when the zygote in its turn comes to form gametes, the partnership is broken and the process is reversed. Mendelism Third Edition This means that the zygote or fertile ovum contains double the number of chromosomes possessed by either gamete, and that, moreover, each tissue-cell of the new individual will contain this dual number. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z On the other hand, the male bee is a portion of a female zygote—the queen-bee. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Of the two daughter-cells produced from the zygote, one continued dividing at a very slow rate, and without showing any specialization. Applied Eugenics Half the zygotes will be HA, one-fourth HH and one-fourth AA. Taboo and Genetics A Study of the Biological, Sociological and Psychological Foundation of the Family And as it takes two gametes to form a zygote, we are in the position of attempting to decide the properties of two unknowns from one known. Mendelism Third Edition When fertilisation occurs the zygote therefore contains 2N chromosomes and becomes female. Hormones and Heredity If this is true, the centrosome of the zygote nucleus must be entirely derived from that of the male pronucleus. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Allelomorphism, a relation between two or more factors, such that two which are present in one zygote do not both enter into the same gamete, but are separated into sister gametes. Applied Eugenics This, however, appeared later as a product of the further evolution of the zygote, and the reduction division was correspondingly postponed. Darwin and Modern Science But when several factors can modify the same structure it is reasonable to suppose that they will influence one another in the effects which their simultaneous presence has upon the zygote. Mendelism Third Edition Heredity thus continues from gamete to gamete, not from zygote to soma, and then from soma to gamete. Hormones and Heredity In Echinus, for instance, the two pronuclei fuse, and the spindle and chromosomes are formed from the zygote nucleus, whereas in the mouse the two pronuclei retain their distinctness during the formation of the chromosomes. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Nevertheless, upon the gamete depend those inherent faculties which enable the zygote to profit by his opportunities, and, unless the zygote has received them from the gamete, the advantages of education are of little worth. Mendelism Third Edition In reality we are of four kinds, male zygotes and female zygotes, large gametes and small gametes, and heredity is the link that binds us together. Mendelism Third Edition Reversion here comes about in F2, when the redistribution of the factors leads to the formation of zygotes containing one of the two factors but not the other. Mendelism Third Edition Here no injury had been done to the zygote nucleus, but these particular granules and the portion of protoplasm containing them were necessary for the formation of germ cells. Hormones and Heredity Is it, in other words, an unalterable property of the zygote, a genetic character? Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Owing to their peculiar power of growth and the relatively large size to which they attain, many of the properties of zygotes are appreciable by observation. Mendelism Third Edition At present our only way of appreciating those differences is to observe the properties of the zygotes which they form. Mendelism Third Edition The interaction of the factors affects the characters of the zygote, but makes no difference to the distribution of the separate factors, which is always in strict accordance with the ordinary Mendelian scheme. Mendelism Third Edition On the chromosome theory as formulated by Morgan this factor must be in the somatic chromosomes and not in the sex-chromosomes, and must be present in every zygote. Hormones and Heredity The first change the zygote undergoes in all animals is what is generally called the segmentation or cleavage of the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z But the problem of the way in which characters are distributed from gamete to zygote and from zygote to gamete remained as before. Mendelism Third Edition Gametes represented by small and zygotes by larger circles. Mendelism Third Edition A few cases have been worked out in which the distribution of the different factors to the gametes is affected by their simultaneous presence in the zygote. Mendelism Third Edition When a gamete with 8 chromosomes unites in fertilisation with a normal gamete with 7 the zygote has 15. Hormones and Heredity The factor, then, is what corresponds in the gamete to the unit-character that appears in some shape or other in the development of the zygote. Mendelism Third Edition Three out of the 16 zygotes contain R but not P, and these must be rose-combed birds. Mendelism Third Edition But when both are present in the same zygote their combined effect is to produce the walnut comb, a comb which is quite distinct from either and in no sense intermediate between them. Mendelism Third Edition Four zygotes are destitute of P, though they may or may not contain I. These birds are completely devoid of pigment like the Brown Leghorn. Mendelism Third Edition When the female gametes segregated, some would always be mY, and some zygotes therefore MXmY. Hormones and Heredity Expressed in Mendelian terms, the production of the agouti was the necessary consequence of the meeting of the factors C and G in the same zygote. Mendelism Third Edition From the union of two such gametes, provided that they are still capable of fertilisation, comes the zygote which in course of growth develops the new character. Mendelism Third Edition They may repel one another, refusing, as it were, to enter into the same zygote, or they may attract one another, and, becoming linked together, pass into the same gamete, as it were by preference. Mendelism Third Edition If the mathematical faculty has been carried in by the gamete, the education of the zygote will enable him to make the most of it. Mendelism Third Edition Reversed specimens occasionally occur in many species of Pleuronectidae, and if the determinants for a reversed head and a normal body were united in one zygote, the curious abnormality observed might be the result. Hormones and Heredity Of the eight different kinds of zygote formed only one contains P in the absence of I, and this is a female. Mendelism Third Edition All these things are but the transfer from zygote to zygote of something extrinsic to the species. Mendelism Third Edition Better hygiene and better education, then, are good for the zygote, because they help him to make the fullest use of his inherent qualities. Mendelism Third Edition But if the basis is not there, no amount of education can transform that zygote into a mathematician. Mendelism Third Edition My conclusion from the evidence is that any process of congenital development may in particular zygotes exhibit a mutation, a departure from the normal. Hormones and Heredity At the moment of union of two gametes is decided the character of another zygote, as well as the nature of the population of gametes which must make its home within him. Mendelism Third Edition The union once affected the inevitable sequence takes its course, and whether it be good, or whether it be evil, we, the zygotes, have no longer power to alter it. Mendelism Third Edition For it is the essence of Mendelism as of Weismannism that not only sex but all other congenital characters are determined in the fertilised ovum or zygote. Hormones and Heredity But the qualities themselves remain unchanged in so far as the gamete is concerned, since the gamete pays no heed to the intellectual development of the zygote in whom he happens to dwell. Mendelism Third Edition The zygote therefore, whether the sex of it is determined as male or female, has the same factor for the development of milk glands. Hormones and Heredity In the earthworms, for instance, we have, in every individual developed from a zygote, ova and spermatozoa developing in different gonads in different parts of the body. Hormones and Heredity When one difference between two breeds is considered, e.g. rose comb and single in fowls, and individuals are crossed, we have the determinant for rose and the determinant for single in the same zygote. Hormones and Heredity On fertilisation half the zygotes have XX and half XY, whether Y is absence of a sex-chromosome, or one of the other Y forms above mentioned. Hormones and Heredity |
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