| 单词 | polar body |
| 例句 | It will have one diplomat, whose work will focus on business outreach, science and the Arctic Council, a polar body comprising the eight Arctic states of Russia, the U.S., U.S. opens northernmost diplomatic station, in Arctic Norway 2023-10-27T04:00:00Z Tromsoe is also the seat of the Arctic Council, a polar body comprising the eight Arctic states of Russia, the US, Canada, Finland, Norway, Iceland, Sweden and Denmark. U.S. opens its northernmost diplomatic station, in Arctic Norway 2023-10-27T04:00:00Z In this process, cellular sacs called polar bodies are created as byproducts that contain chromosomes and can fertilize the egg. Why a crocodile’s ‘virgin birth’ isn’t a miracle 2023-06-10T04:00:00Z This results in the production of a secondary oocyte and one polar body. Fundamentals of Biology 2015-01-01T00:00:00Z This second cell is called a polar body and usually dies. Biology for AP Courses 2022-06-09T00:00:00Z The unneeded complement of genetic material that results is stored in a second polar body that is eventually ejected. Anatomy and Physiology 2013-06-19T00:00:00Z Neither the speedy results nor the large polar bodies necessarily point to problems with the eggs, she says. These lab-grown human eggs could combat infertility—if they prove healthy 2018-02-08T05:00:00Z In vertebrates like crocodiles, one polar body can synthesize with the egg to make offspring. Why a crocodile’s ‘virgin birth’ isn’t a miracle 2023-06-10T04:00:00Z The meiotic division is arrested in metaphase II. Fertilization triggers completion of the second meiotic division and the result is one ovum and an additional polar body. Fundamentals of Biology 2015-01-01T00:00:00Z One egg is produced from each meiotic process, with the extra chromosomes and chromatids going into polar bodies that degenerate and are reabsorbed by the body. Biology for AP Courses 2022-06-09T00:00:00Z As noted earlier, the polar body that results from unequal cell division simply degrades. Anatomy and Physiology 2013-06-19T00:00:00Z They occur when an egg divides in two during ovulation, creating a primary body and a polar body, both of which have the same genetics. The Science of How Women Can Have Twins With 2 Different Fathers 2015-05-08T04:00:00Z The process is called a polar body biopsy and involves testing each egg’s DNA, then keeping only those that are normal, which would greatly increase the odds of a successful pregnancy. Later, Baby: Will Freezing Your Eggs Free Your Career? 2014-04-17T10:00:02Z In you, meiosis generates eggs or sperm — either four sperm, or one egg and three degenerate polar bodies. How Ballistic Cup Fungi Fire Their Spores (and Look Cool Doing It) 2012-09-05T20:45:15.367Z In Fig. 10b the chromosomes are seen paired and ready for the first division; that is, for the formation of the first polar body. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The smaller cell, called the first polar body, may or may not complete meiosis and produce second polar bodies; in either case, it eventually disintegrates. Anatomy and Physiology 2013-06-19T00:00:00Z Before fertilisation is accomplished the nucleus of the ovum normally divides twice in rapid succession, and gives off two abortive cells—known as polar bodies—which come to nothing. Herbert Spencer 2012-02-29T03:00:20.773Z For Parthenogenesis. instance, it has been said that parthenogenetic ova form only one polar body. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The three polar bodies and the egg are comparable to the four sperms. A Critique of the Theory of Evolution The scheme of this formation of the polar bodies is indicated in Fig. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z Stages in the formation of the polar bodies in the ovum of a star-fish 125 34. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions A parthenogenetic ovum gives off one polar body—though without reduction in the number of chromosomes—and then proceeds by asexual multiplication or ordinary cell division to build up a body. Herbert Spencer 2012-02-29T03:00:20.773Z As a general rule the o�cyte divides unequally twice, giving rise to two small cells called polar bodies, and to the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z After the extrusion of the polar bodies there are 24 chromosomes in the egg. A Critique of the Theory of Evolution In the meantime, typically, a third polar body is formed by division of the first. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z First of all the nucleus discharges its polar bodies, as previously mentioned, and in the manner here depicted on the previous page. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions The disproportion is so great between the two cells, that the phenomenon does not at first suggest the idea of cell division, and it is usually described as the extrusion of the first polar body. Text Book of Biology, Part 1: Vertebrata The polar bodies are oval, but as a rule they are so small as to be incapable of fertilization. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The divisions are unequal, so that two small polar bodies are formed one of these subsequently divides. A Critique of the Theory of Evolution Even more important is the significance of the "polar bodies," as explained by Weismann in one of his Essays; since, if his interpretation of them be correct, variability is a necessary consequence of sexual generation. Darwinism (1889) I. The second polar body has just been extruded; both male and female pronuclei contain two chromatin particles; those of the male pronucleus are becoming transformed into a skein. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions There follows a second and similar small cell, behind the first, the second polar body. Text Book of Biology, Part 1: Vertebrata In the maturation of ordinary ova two polar bodies are formed, but in parthogenetic ova only one. The Gutenberg Webster's Unabridged Dictionary Section P and Q Each egg of such a female will contain one "black" X after the polar bodies have been thrown off. A Critique of the Theory of Evolution Not only in the frog's ovum, but in all vertebrata, two polar bodies are given off in this way before the sexual process occurs. Text Book of Biology, Part 1: Vertebrata The phenomena of the extrusion of polar bodies and fertilization are treated of later, and will, therefore, not be considered now. Text Book of Biology, Part 1: Vertebrata Very little protoplasm is given off with the polar bodies; they play no further part in development, but simply drop off and disappear. Text Book of Biology, Part 1: Vertebrata The first polar body formed is usually larger than the second one, and often divides into two after its separation from the ovum. The Gutenberg Webster's Unabridged Dictionary Section P and Q |
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