单词 | gamete |
释义 | gameten. Biology. Each of the two reproductive cells, typically haploid and distinguishable into male and female types, which fuse to form a zygote in sexual reproduction; a fully mature germ cell; an egg cell or sperm cell.See also anisogamete and isogamete. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > reproductive substances or cells > [noun] > gametes gamete1878 zoogamete1879 planogamete1880 macrogamete1888 microgamete1888 isogamete1891 megagamete1891 oogamete1891 progamete1892 heterogamete1897 ovum1900 non-crossover1914 merogamete1925 hologamete1926 anisogamete- 1878 Jrnl. Bot., Brit. & Foreign 16 57 For the swarm-spores the term ‘gametes’ is proposed, the spore being called ‘gametangium’. The mass of copulated gametes is called a ‘zygote’. 1899 Nature 21 Sept. 509/1 Heredity, then, is really applicable only to the appearance in a zygote of some of the properties of the gametes. 1914 Pop. Sci. Monthly June 525 The sperm, or male gamete, is among the smallest of all cells and is usually many thousands of times smaller than the egg. 1945 Brit. Med. Jrnl. 17 Feb. 236/1 Artificial insemination is proposed only for that..unfortunate minority of couples who are sterile due to some fault in the husband's sperm or to incompatibility between otherwise normal gametes. 1975 Times 7 Aug. 14/5 When gametes are formed from a heterozygous plant all sorts of different genetic combinations are produced, which on fertilization produce a wide range of plant types. 1998 Church Times 20 Nov. 14/4 It is difficult to make sense of a determination to encourage a responsible attitude to parenthood while the state fails to take a critical view of the practice of anonymous donation of gametes. 2011 Herald-Times (Bloomington, Indiana) 16 Dec. a7/4 The zygote formed by the union of two gametes is a new individual. Compounds C1. General attributive and objective. ΚΠ 1891 Bot. Gaz. 16 179 A plant which produces gametes (whether they be isogametes..or spermatozoids and eggs—both or either) is a gamete-producing plant or gametophyte. 1914 P. Geddes Sex ii. 45 These foci of gamete-making began to be enclosed..and nourished by adjacent tissue. 1927 J. B. S. Haldane & J. S. Huxley Animal Biol. ii. 63 Before gamete-formation, the two members of such a pair segregate. 1963 R. P. Dales Annelids viii. 164 The posterior gamete-producing segments. 1985 Cambr. Encycl. Life Sci. iii. 115/1 If we consider all the gametes produced by the population as a whole (the ‘gamete pool’) the proportion of gametes carrying allele A will be p and that of gametes carrying allele a will be q. 2007 Globe & Mail (Canada) (Nexis) 17 May l1 The clinic claims to be the first in Canada to provide long-term gamete storage to young men and women who are fertile but not ready to be parents. C2. gamete intrafallopian transfer n. Medicine = GIFT n.2 ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > fecundation or impregnation > [noun] > techniques for facilitating IVF1978 gamete intrafallopian transfer1984 GIFT1984 ZIFT1988 1984 R. H. Asch et al. in Lancet 3 Nov. 1034/1 We report here the first pregnancy obtained after translaparoscopic gamete intrafallopian transfer (GIFT). 1996 Indianapolis Monthly May 80/2 In the GIFT procedure (short for gamete intrafallopian transfer), extra eggs are surgically transferred to the fallopian tubes, where they are inseminated. 2009 H. Murkoff & S. Mazel What to Expect before you’re Expecting 172/2 There's no greater gift than a baby—and gamete intrafallopian transfer (GIFT) is a procedure that can help deliver that gift to hopeful couples. This entry has been updated (OED Third Edition, March 2013; most recently modified version published online March 2022). < n.1878 |
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