单词 | gynogenesis |
释义 | gynogenesisn. Zoology. Reproduction in which the development of the embryo occurs as a result of the penetration of an ovum by a sperm but does not involve the nuclear material of the latter. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > types of reproduction > [noun] > sexual syngenesis1836 bisexuality1850 gamogenesis1858 amphigony1876 amphimixis1893 oogamy1894 androgenesis1895 merogamy1901 gynogenesis1925 1925 E. B. Wilson Cell (ed. 3) v. 460 In a nearly related phenomenon, which may be called gynogenesis, the sperm penetrates (and in some cases activates) the egg but otherwise takes no part in the processes of development. 1952 Boyd & Hamilton in A. S. Parkes Marshall's Physiol. Reprod. (ed. 3) II. xiv. 42 Gynogenesis may occur to a limited degree in mammals as the result of irradiation of the semen. 1969 R. F. Chapman Insects xix. 380 An unusual type of thelytoky, known as gynogenesis, occurs in the form mobilis of Ptinus clavipes (Coleoptera). The form mobilis exists only as triploid females which reproduce parthenogenetically, but the development of eggs is triggered by healthy sperm of P. clavipes or, less successfully, of P. pusillus. Derivatives gynogeˈnetic adj. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > types of reproduction > [adjective] > sexual sexual1794 gamic1858 gamogenetic1858 syngenetic1864 digenous1884 sexuparous1899 androgenetic1903 gynogenetic1925 1925 E. B. Wilson Cell (ed. 3) v. 463 The conclusion seems probable..that even in such (presumably) diploid larvæ development is gynogenetic, the diploid number having been restored by a doubling of the maternal haploid group. 1964 L. B. Russell in C. Pavan et al. Mammalian Cytogenetics 64 Ultraviolet irradiation of spermatozoa can destroy the paternally contributed chromatin without affecting the activating function of the sperm and thus lead to gynogenetic haploids. This entry has not yet been fully updated (first published 1972; most recently modified version published online June 2018). < n.1925 |
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