| 单词 | germ cell |
| 例句 | They cite the great penetrating power of radiation, but doubt that chemicals could reach the germ cells. Silent Spring 1962-09-27T00:00:00Z And there are indications that these chemicals lodge in tissues concerned with the manufacture of germ cells as well as in the cells themselves. Silent Spring 1962-09-27T00:00:00Z A special kind of cell division occurs in the formation of the germ cells. Silent Spring 1962-09-27T00:00:00Z The fact of insecticide storage in the germ cells of any species should therefore disturb us, suggesting comparable effects in human beings. Silent Spring 1962-09-27T00:00:00Z Although discussions of mutations usually refer to those in the germ cells, which may then make their effect felt in future generations, there may also be mutations in the body cells. Silent Spring 1962-09-27T00:00:00Z One alternative solution might be to mature the germ cells in a Petri dish – essentially, to grow sperm in the lab. 'It gives you hope': the fight to save the fertility of children with cancer 2018-12-15T05:00:00Z I can see immature germ cells, and cross-sections of small coiled tubes, part of an intricate network through which the sperm will eventually travel. 'It gives you hope': the fight to save the fertility of children with cancer 2018-12-15T05:00:00Z In this process, the typical elongated sperm cells are formed from round germ cells. Possible cause of male infertility 2023-10-27T04:00:00Z Researchers write that the new discovery has important implications for human fertility and germ cell therapy. Mature sperm lack intact mitochondrial DNA 2023-09-18T04:00:00Z Muscle is contractile tissue and is derived from the mesodermal layer of embryonic germ cells. Fundamentals of Biology 2015-01-01T00:00:00Z As with sperm production, oogenesis starts with a germ cell. Concepts of Biology 2013-04-25T00:00:00Z But some ancient retroviruses gained the ability to infect germ cells, such as egg or sperm, that do pass their DNA down to future generations. How the Ancient Viral DNA in Our Genome Affects Disease and Development 2022-10-19T04:00:00Z Telomerase is typically active in germ cells and adult stem cells. Biology for AP Courses 2022-06-09T00:00:00Z Now we know that characteristics are passed on by DNA in the germ cells: sperm in the male, and eggs in the female. Miller & Levine Biology 2018-01-01T00:00:00Z This process takes place in all normally dividing cells of the body except for the germ cells that produce eggs and sperm. Anatomy and Physiology 2013-06-19T00:00:00Z The gametes are produced from diploid germ cells, a special cell line that only produces gametes. Concepts of Biology 2013-04-25T00:00:00Z By targeting germ cells, these retroviruses became incorporated into human ancestral genomes over the course of millions of years and may have implications for how researchers screen and test for diseases today. How the Ancient Viral DNA in Our Genome Affects Disease and Development 2022-10-19T04:00:00Z Mutations can affect either somatic cells or germ cells. Biology for AP Courses 2022-06-09T00:00:00Z Hess announced last October after experiencing chest tightness and shortness of breath that a cancerous germ cell tumor was found sitting in the center of his chest, pressing against his heart and lungs. Rays’ Hess returns from cancer treatment, pitches in minors 2022-06-07T04:00:00Z The fifth stage of germ cell formation—spermatozoa, or formed sperm—is the end result of this process, which occurs in the portion of the tubule nearest the lumen. Anatomy and Physiology 2013-06-19T00:00:00Z Telomerase is typically found to be active in germ cells, adult stem cells, and some cancer cells. Concepts of Biology 2013-04-25T00:00:00Z It involves introducing primordial germ cells from an endangered species into an embryo of a surrogate species, such as a chicken. In a conservation first, a cloned ferret could help save her species 2022-01-13T05:00:00Z If a mutation takes place in germ cells, the mutation will be passed on to the next generation, as in the case of hemophilia and xeroderma pigmentosa. Biology for AP Courses 2022-06-09T00:00:00Z Researchers found various types of cells, including red blood cells and “primordial germ cells” that give rise to egg or sperm cells. New research offers glimpse into early human development 2021-11-17T05:00:00Z These include supporting cells called sustentacular cells, as well as five types of developing sperm cells called germ cells. Anatomy and Physiology 2013-06-19T00:00:00Z He was admitted to a hospital with unusual pain nine days earlier and was diagnosed with an aggressive form of germ cell cancer. This week’s passages 2021-06-25T04:00:00Z These germ cells then migrate to the chicken’s gonads and become sex cells. In a conservation first, a cloned ferret could help save her species 2022-01-13T05:00:00Z The sperm cells are mixed with “nursemaid” cells called Sertoli cells which protect the germ cells and promote their development. Biology for AP Courses 2022-06-09T00:00:00Z The exception is if the altered DNA is put into a germ cell: the cells that turn into sperm and eggs. The Gene Drive Dilemma: We Can Alter Entire Species, but Should We? 2020-01-08T05:00:00Z Sertoli cells secrete signaling molecules that promote sperm production and can control whether germ cells live or die. Anatomy and Physiology 2013-06-19T00:00:00Z If they infect germ cells, the DNA they’re embedding into is the germline, and the viral DNA can potentially catch a ride into future generations. What a Koala Virus Tells Us About the Human Genome 2019-10-14T04:00:00Z Any mutations occurring in the dividing cells of a stem will be locked into the germ cells and can pass on to the next generation. Meet the monkeyflower, a weed that may hold the key to zebra stripes and other biological mysteries 2019-08-29T04:00:00Z The inner cell mass contains embryonic stem cells, whereas the germ cells originate from the trophoblast. Biology for AP Courses 2022-06-09T00:00:00Z San Diego, decided to try putting the Crispr editing machinery into a germ cell, along with the gene it was originally tied to. The Gene Drive Dilemma: We Can Alter Entire Species, but Should We? 2020-01-08T05:00:00Z She suspects that oskar was probably doing something completely different in its earlier guise, related to the development of insects’ brains and nervous systems, only later becoming important for developing germ cells. The biologist overturning evolutionary doctrine 2019-07-02T04:00:00Z Researchers note that the occurrence is very similar to that of a teratoma, which is a type of embryonal tumor that typically forms from germ cells. Newborn has partially developed twin removed from abdomen day after birth 2019-03-21T04:00:00Z But flowers, which contain both kinds of germ cells—pollen and ova—form from active somatic tissue at the tips of growing stems. Meet the monkeyflower, a weed that may hold the key to zebra stripes and other biological mysteries 2019-08-29T04:00:00Z No, the mutations causing the cancer are in somatic cells, not reproductive germ cells. Biology for AP Courses 2022-06-09T00:00:00Z Editing so-called germ cells—the genes of sperm, eggs and embryos—is even more controversial because any changes would pass on to future generations, giving a tiny blip potentially far-reaching consequences. Chinese Scientist Claims World’s First Genetically Modified Babies 2018-11-26T05:00:00Z The prevailing theory held that most animals formed their germ cells early in development, thanks to molecules inherited from the mother. The biologist overturning evolutionary doctrine 2019-07-02T04:00:00Z Figure 1 | Expression of the transcription factor OTX2 declines in cells that will form primordial germ cells. How to lose your inheritance 2018-10-02T04:00:00Z These parts of the genome probably get repeated during meiosis, when a single cell divides to generate germ cells. Scientists are untangling our bodies’ genetic “double-edged swords” 2018-06-09T04:00:00Z The germ cells are generated early in the development of the zygote. Biology for AP Courses 2022-06-09T00:00:00Z Early during an embryo’s development, the germ cells — which are basically the cellular grandparents or great grandparents of sperm — travel to the nascent gonads. Transplanted testicles will always make the donor’s sperm 2018-04-26T04:00:00Z Popular model organisms, including flies and roundworms, all generate their germ cells that way. The biologist overturning evolutionary doctrine 2019-07-02T04:00:00Z One must have had an abnormal egg or sperm that retained two copies of its chromosomes instead of the usual single set that is in such germ cells, Lyko explains. An aquarium accident may have given this crayfish the DNA to take over the world 2018-02-05T05:00:00Z After a five day recovery period for a subset of the samples, only a partial recovery from the effects of the ibuprofen was observed, but only germ cells appeared to bounce back. Ibuprofen taken in early pregnancy could affect daughter's fertility – study 2018-02-01T05:00:00Z One possible explanation is that the DNA repair response is different in germ cell meiotic M phase compared to mitotic M phase in cultured cells. Correction of a pathogenic gene mutation in human embryos : Nature : Nature Research 2017-08-01T04:00:00Z “Father’s nutrition status may somehow influence the health, quality and function of germ cells, which are involved in reproduction,” the researchers from University College Dublin concluded in their presentation. 5 Ways Men Shape Their Children’s Health 2017-05-31T04:00:00Z Keen to understand the wider picture, Extavour embarked on a first-of-its-kind review of existing data on the mechanisms that specify germ cells in a wide range of organisms, from jellyfish to turtles. The biologist overturning evolutionary doctrine 2019-07-02T04:00:00Z At the earliest stages of life, in the embryo, our germ cells begin to develop. Why humans develop sex cells as embryos — but corals don't 2016-12-19T05:00:00Z They used a mixture of proteins and growth factors to prod both types of stem cells into becoming the primordial germ cells that are the precursor of eggs, the scientists said. Japanese Scientists Master Egg Creation Process in Mice 2016-10-17T04:00:00Z That recreates, they note, a full cycle of female germ cell development in the lab. Mouse egg cells made entirely in the lab give rise to healthy offspring 2016-10-17T04:00:00Z The second charity set to benefit is The Robin Cancer Trust, which aims to raise awareness of germ cell cancers. Artists draw Premier League goals to support charities - BBC News 2016-08-21T04:00:00Z Sister germ cells provide organelles and cytoplasm to oocytes to augment their developmental potential. Mouse oocytes differentiate through organelle enrichment from sister cyst germ cells | Science 2016-03-31T04:00:00Z The organizing committee stopped short of calling for a ban on editing human embryos and germ cells for basic research. Gene-editing summit supports some research in human embryos 2015-12-02T05:00:00Z Just one published study describes genome editing of human germ cells. Genome editing: 7 facts about a revolutionary technology 2015-11-29T05:00:00Z It’s known that germ cells that go on to make egg and sperm are also quite mobile and do migrate: in this man’s case, apparently from his unborn twin to him. How a Man's Unborn Twin Fathered His Child 2015-10-28T04:00:00Z Several prominent scientists argued in Nature in March that there were “serious risks” around editing germ cells. Why the Case Against Designer Babies Falls Apart 2015-07-30T04:00:00Z Sister germ cells provide organelles and cytoplasm to oocytes to augment their developmental potential. Mouse oocytes differentiate through organelle enrichment from sister cyst germ cells | Science 2016-03-31T04:00:00Z Editing human germ cells and embryos is illegal in many countries and is widely considered unethical4, 5. DNA editing in mouse embryos prevents disease 2015-04-22T04:00:00Z The law on editing human germ cells varies wildly across the world. Genome editing: 7 facts about a revolutionary technology 2015-11-29T05:00:00Z “Therefore, they may also interact with sensitive human cells like the germ cells,” which produce eggs and sperm, he says. Pesticides on Vegetables and Fruit Linked to Lower Sperm Counts 2015-03-30T04:00:00Z Cells involved in reproduction are called germ cells. Why the Case Against Designer Babies Falls Apart 2015-07-30T04:00:00Z But they wanted to know whether the engineered gene could make it through the germ cells and invade the next generation. 'Chain reaction' spreads gene through insects 2015-03-19T04:00:00Z Key to all discussion and future research is making a clear distinction between genome editing in somatic cells and in germ cells. Don’t edit the human germ line 2015-03-11T04:00:00Z The study used human embryonic skin stem cells to create primordial germ cells - known as PGCs. Biological Babies For Same-Sex Parents a Possibility After Stem Cell Breakthrough 2015-02-25T05:00:00Z Because of spontaneous mutations in germ cells — sperm and eggs — each generation of our species is subtly different. Random Chance’s Role in Cancer 2015-01-19T05:00:00Z In particular, their ‘epigenetic’ pattern — chemical modifications to the chromosomes that affect gene expression — was similar to those of primordial germ cells. Rudimentary egg and sperm cells made from stem cells 2014-12-23T05:00:00Z And the passenger pigeon work may be helped along by similar germ cell efforts in the chicken and houbara bustard—a rare bird prized by oil sheikhs with the funds to attempt a genetic rescue. Ancient DNA Could Return Passenger Pigeons to the Sky 2014-08-29T04:00:00Z For these two stressors, samples were collected 30 min after exposure, corresponding to an ‘early response test’ showing suppression of germ cell production is not immediate. Diversity and dynamics of the Drosophila transcriptome : Nature : Nature Publishing Group 2014-03-15T04:00:00Z The first question is how the effects of environmental exposure become embedded in an animal's germ cells — in this case, the mouse's sperm. Epigenetics: The sins of the father 2014-03-05T18:50:37.761Z Molecular biologists will begin by trying to culture germ cells from a band-tailed pigeon. The Mammoth Cometh 2014-02-27T10:00:19Z How do you track the development of germ cells in the lab? Debate on Evolution of Multicellular Organisms Starts to Gain Focus 2013-09-30T22:45:00.843Z In the mouse, germ cells emerge just after the first week of embryonic development, as a group of around 40 PGCs. Stem cells: Egg engineers 2013-08-21T17:50:20.380Z The scientists would inject these germ cells into developing band-tailed pigeons. Scientists look to revive the long-extinct passenger pigeon 2013-07-08T17:24:00Z The ability to isolate these tumors allowed us to reveal their common molecular features characterized by the acquisition of embryonic stem cell/germ cell gene expression profiles and the down-regulation of immune response genes. [Research Articles] Ectopic Activation of Germline and Placental Genes Identifies Aggressive Metastasis-Prone Lung Cancers 2013-05-22T18:55:05.923Z The genetically engineered germ cells integrate into the embryo; into its gonads, to be specific. The Mammoth Cometh 2014-02-27T10:00:19Z Extavour's special expertise is in tracking the development of germ cells, the cells created in an embryo that contain the genetic code for reproducing multicellular organisms. Debate on Evolution of Multicellular Organisms Starts to Gain Focus 2013-09-30T22:45:00.843Z Sperm and eggs fuse and divide repeatedly, eventually creating more germ cells to continue the "immortal germline." Prolonging the buzz with Grandma 2013-05-22T12:45:03.507Z Edit the DNA from a band-tailed pigeon germ cell – the type that develops into sperm or eggs – to match that of the passenger pigeon. Beware the Frog Zombie Clones: The Science and Ethics of Raising the Dead 2013-04-12T17:49:26Z The researchers extracted the DNA from mouse primordial germ cells — the precursors to sperm and eggs — at various stages of development and used markers to spot any methylated genes. Genetic reactions to stress might be felt in later generations, mouse studies show 2013-02-04T22:03:58Z The DNA within these early germ cells carries 'epigenetic modifications' — structural changes that do not affect the DNA sequence itself but do affect the way that genes are expressed. First Road Map of Human Sex-Cell Development 2012-12-17T15:45:00.417Z Clark adds that the immediate impact of the work will be on understanding the molecular mechanisms involved in forming germ cells. Sperm and Eggs Created in Dish Produce Mouse Pups 2012-10-04T19:10:00Z The left-handed batsman made an emotional comeback after his treatment for a rare germ cell cancer. India Ink: Yuvraj Singh's Roaring Comeback Quiets Critics 2012-09-13T05:11:51Z Hope that the germ cell will migrate into the gonads of the developing chick. Beware the Frog Zombie Clones: The Science and Ethics of Raising the Dead 2013-04-12T17:49:26Z By broadening their search to look for any germ cell that expresses Ddx4, he says that Liu and colleagues cast their nets too wide. Stem Cell Study Scrambles Egg Debate, Again 2012-07-10T20:42:35Z Next, we need to look at what is missing to coax immature germ cells to become eggs or sperm in the lab. First Road Map of Human Sex-Cell Development 2012-12-17T15:45:00.417Z Man has probably 16 chromosomes in the somatic cell, and the mature male and female germ cells in man contribute eight chromosomes each to the nucleus of the impregnated ovum. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z This explanation is in harmony with the occurrence of typical mitosis in active tissue cells on the one hand, and of amitosis in the relatively quiescent primary germ cells on the other. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z Scientists also need to figure out how to turn bird stem cells into germ cells, something within reach, but not yet accomplished. Beware the Frog Zombie Clones: The Science and Ethics of Raising the Dead 2013-04-12T17:49:26Z The field has its origins in 1927, when Muller discovered that x-rays caused mutations in male fruit fly germ cells, which led him to voice concerns about the use of x-rays in medicine. Attack on Radiation Geneticists Triggers Furor 2011-10-18T20:32:09Z Similarly, their risk of germ cell tumors, a rare form of brain tumor in children, was elevated more than six-fold. Birth defects tied to child brain tumors 2011-08-10T21:16:05Z Sperm and eggs develop from what are known as primordial germ cells. Sperm Made (Mostly) in a Dish Produce Normal Mice 2011-08-04T17:01:00Z By hereditary conditions must be understood strictly those which result from alterations in the germ cells of the parents. Mentally Defective Children 2011-06-19T02:00:24.963Z During that annual exam, doctors discovered a cyst on Miller's ovary that turned out to be a germ cell malignancy. Olympic champion using her cancer to educate women 2011-02-25T19:32:20Z This perfectly simple principle is known as the law of segregation, or the law of the purity of the germ cells. Catholic Churchmen in Science Reproduction is nothing more than a transition from one generation to the next following, mediated by the idioplasm of the germ cell. A Mechanico-Physiological Theory of Organic Evolution These germ cells are produced in early stage embryos in a mass of cells called the epiblast. Sperm Made (Mostly) in a Dish Produce Normal Mice 2011-08-04T17:01:00Z An intoxication alone seems capable of exercising upon the latter a sufficiently general action to reach the germ cells, and by far the most frequent poison is alcohol. Mentally Defective Children 2011-06-19T02:00:24.963Z It is the commonly accepted assumption that the fixed habit of growth of the species is transmitted from generation to generation through the chromosomes of the germ cells. The Chemistry of Plant Life There was a mouth and then there were eyes, each feature bringing others into focus, unfolding as a germ cell divides and grows, calling into existence an entire creature. Forget Me Nearly The germ cells are the elements in which the life and growth of the parental individual are continued. A Mechanico-Physiological Theory of Organic Evolution Even in observing illustrations of Mendel's laws allowance has to be made for the variability due to "chance" meetings of germ cells. The Social Direction of Evolution An Outline of the Science of Eugenics A study of the germ cells of Aphis rosæ and Aphis œnotheræ. Studies in Spermatogenesis Part II We can explain this result as due to the assortment of factors for these characters in the germ cells according to a definite law. A Critique of the Theory of Evolution These variations may not show until the animal has grown up, but they must have taken place among the determinants in the germ cell or they would not reappear in subsequent generations. The Meaning of Evolution Organisms arise from a germ cell which consists of idioplasm and in turn they produce like germ cells. A Mechanico-Physiological Theory of Organic Evolution Here also belong the results of training and education; we can train and educate brain cells but not germ cells. The Social Direction of Evolution An Outline of the Science of Eugenics When a person whose pigment determiners have come from one side of the house forms germ cells, half will have and half will lack the determiner. Introduction to the Science of Sociology We know how the factors carried by the parents are sorted out to the germ cells. A Critique of the Theory of Evolution He never pretended that there was the faintest corroborating evidence visible to the microscope in the organ, in the blood, or in the germ cell. The Meaning of Evolution The fact that the mother furnishes the germ cell with nutritive plasm and that she nourishes it for a considerable time does not increase the number of maternal determinants nor their capability of development. A Mechanico-Physiological Theory of Organic Evolution In the white variety all the germ cells are alike in lacking this determiner; blackness is entirely absent and all their descendants are formed from germ cells entirely without black determiners. The Social Direction of Evolution An Outline of the Science of Eugenics So the second principle is that unit-characters are inherited through determiners in the germ cells. Introduction to the Science of Sociology In other words, the two factors that have been brought together in the hybrid separate in its germ cells. A Critique of the Theory of Evolution Now we know that the child comes from the germ cells which are not made by the bodies of the parents but have arisen by the division of the antecedent germ cell. Manhood of Humanity. It is the medium through which the Holy Spirit is conveyed, the germ cell in which the Divine life is enfolded. The Ministry of the Spirit The result may be expressed algebraically as follows, using the letters B and W to indicate respectively germ cells with and without the black color determiner. The Social Direction of Evolution An Outline of the Science of Eugenics Now when both parents have brown eyes and come from an ancestry with brown eyes, it is probable that all of their germ cells contain the determiner for brown iris pigmentation. Introduction to the Science of Sociology Diagram illustrating the history of the factors in the germ cells of the cross shown in Fig. A Critique of the Theory of Evolution Consequently it is not possible to hold, that the body generates germ cells, nor that the soul generates souls. Manhood of Humanity. The germ cell—as has been established by the microscope—is the tiny cell which in the lowest living organisms as well as in man himself, forms the unit of physical development. Sex Avoided subjects Discussed in Plain English The relation of the germ cells and the organisms forming them and developing from them is shown in the diagram in Fig. The Social Direction of Evolution An Outline of the Science of Eugenics In other cases, also, it may be that deeply saturating parental modifications, such as the results of alcoholic and other poisoning, affect the germ cells, and thus the offspring. Introduction to the Science of Sociology Diagram showing history of germ cells of cross of Fig. A Critique of the Theory of Evolution In short, our actual personalities are not predetermined in the germ cells, but our possible personalities are.... Manhood of Humanity. We may be able to treat germ cells with acids or other substances which destroy the cell membrane so as to allow crossing between very widely separated species and genera. Northern Nut Growers Association, Report of the Proceedings at the Third Annual Meeting Lancaster, Pennsylvania, December 18 and 19, 1912 P, parental generation; each individual forms a single kind of germ cells. The Social Direction of Evolution An Outline of the Science of Eugenics Pseudovary: the organ or mass of germ cells of an agamic insect. Explanation of Terms Used in Entomology The larger circles indicate the color of the birds; their enclosed small circles the nature of the factors in the germ cells of such birds. A Critique of the Theory of Evolution Every cell comes from a pre-existing cell by a process of division, and every germ cell comes from a pre-existing germ cell. Manhood of Humanity. There immediately follows the most complete blending of the two germ cells—one from the father and one from the mother—each with its peculiar individual, family, racial, and national characteristics. The Mother and Her Child Each now forms germ cells like those which constituted its own germ. The Social Direction of Evolution An Outline of the Science of Eugenics Spermatogonia: the descendants of the primordial germ cells in the male. Explanation of Terms Used in Entomology Section of the egg of the beetle, Calligrapha, showing the pigment at one end where the germ cells will later develop as shown in the other two figures. A Critique of the Theory of Evolution Our anatomical, physiological, psychological possibilities were predetermined in the germ cells from which we came....” Manhood of Humanity. Conklin says, "Heredity may be defined as the appearance in offspring of characters whose differential causes are found in germ cells." The Family and it's Members The spaces between the large circles represent the bodies of the individuals while the small circles within each represent the germ cells formed by those individuals. The Social Direction of Evolution An Outline of the Science of Eugenics It is by no means impossible that sometimes the germ cell may develop into a spore without being fertilized, as is the case in many of the water moulds. Elements of Structural and Systematic Botany For High Schools and Elementary College Courses In the upper row of the diagram a typical process of nuclear division, such as takes place in the early germ cells or in the body cells. A Critique of the Theory of Evolution We are aware that this apparent impossibility is evaded by the believers in spontaneous generation, who hold that such germ cells may be produced anywhere and at all times. What is Darwinism? It is seen that the sexual cells are formed directly from the germ cell and contain no admixture from the cells of the body. Disease and Its Causes G. F1, germs of the first filial or hybrid generation, each composed of two different kinds of germ cells, one from each parent. The Social Direction of Evolution An Outline of the Science of Eugenics It is clear that in this point also the ordinary conception of the future fate of the soul agrees fundamentally with the result of observation on the prosperity of the series of germ cells. Scientific American Supplement, No. 810, July 11, 1891 That is, while an individual may consist of a colony of millions of cells, all of these spring from one cell and it a germ cell—the fertilized ovum. Taboo and Genetics A Study of the Biological, Sociological and Psychological Foundation of the Family The germ cell draws to itself nourishment from the other part of the egg, and then it grows and reproduces another cell. A Series of Lessons in Raja Yoga The germ cell never comes into the sphere of consciousness and cannot therefore concern us in the psychological study of the phenomena of the sexual instinct. Studies in the Psychology of Sex, Volume 5 Erotic Symbolism; The Mechanism of Detumescence; The Psychic State in Pregnancy Each member of this generation forms two kinds of germ cells in approximately equal numbers. The Social Direction of Evolution An Outline of the Science of Eugenics And what is true in this case, is true of the birth and growth of all animal life—all animal life develops from a single germ cell. A Series of Lessons in Gnani Yoga All the complicated body specializations and sex phenomena may be regarded as super-imposed upon or grouped around this succession of germ cells, continuous by simple division. Taboo and Genetics A Study of the Biological, Sociological and Psychological Foundation of the Family We need not be particularly concerned here with the theoretical explanations of these facts offered in terms of the microscopic or even the infra-microscopic components of the germ cells. Q. E. D., or New Light on the Doctrine of Creation When the protoplasm containing these granules was killed with a hot needle, development in some cases took place and an embryo was formed, but the embryo contained no germ cells. Hormones and Heredity The Care of the Mother During the Embryonic Period Determines Largely the Future Welfare of the Child In common with every organism the infant develops from a single germ cell of almost microscopic size. Parent and Child Volume III., Child Study and Training There is a mental energy resident in the germ cell—of this there can be no doubt. A Series of Lessons in Gnani Yoga The sex glands are especially important as endocrine organs; in fact the somatic cells are organized around the germ cells, as pointed out above. Taboo and Genetics A Study of the Biological, Sociological and Psychological Foundation of the Family If, in any family, minor differences in educability are observed, they can be put down to disturbance of these two factors occurring after the fertilized germ cell had started to divide and reproduce itself. The Glands Regulating Personality 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 The ripe human ovum or germ cell is a spheric cell, about 0.2 mm. in diameter, consisting of granular protoplasm, in which lies a nucleus which contains the germinal spot. The Four Epochs of Woman's Life; a study in hygiene In Chapter I, the "immortality" of the protoplasm in the germ cells of higher animals, as well as in simpler forms without distinct bodies, was mentioned. Taboo and Genetics A Study of the Biological, Sociological and Psychological Foundation of the Family This first divides to form a new group of germ cells, which are within the embryo or new body when it begins to develop, and so on through indefinite generations. Taboo and Genetics A Study of the Biological, Sociological and Psychological Foundation of the Family Puberty is the time of ripening of the specific germ cells. The Glands Regulating Personality When a germ cell divides, its nuclear material breaks up into segments known as chromosomes. The Glands Regulating Personality Before the germ cell becomes fit to mix with a germ cell of opposite sex, in the process of fertilization, it must lose one half of these. The Glands Regulating Personality |
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