| 单词 | alternation of generations |
| 释义 | > as lemmasalternation of generations alternation of generations n. [after German Generationswechsel (1842 in the passage translated in quot. 1845) and post-classical Latin alternatio generationum ( A. von Chamisso De animalibus quibusdam e classe vermium Linnæana (1819) 10)] Biology a pattern of reproduction occurring in the life cycles of plants and some invertebrates, involving a regular alternation between two distinct forms (typically a sexual form and an asexual form, as in ferns, or a dioecious and a parthenogenetic one, as in some jellyfishes); cf. alternate generation n. at alternate adj., adv., and n. Compounds. ΘΚΠ the world > life > biology > biological processes > procreation or reproduction > types of reproduction > [noun] > alternate generation alternate generation1841 alternation of generations1845 metagenesis1849 heterogenesis1863 heterogamy1884 heterogeny1886 heterogony1906 1845 G. Busk tr. J. J. S. Steenstrup (title) On alternation of generations. 1858 G. H. Lewes Sea-side Stud. 287 The solitary Salpa produces the chain-Salpa by ‘budding’; and the chain-Salpa by ‘alternation of generations’ (the phrase is Chamisso's) produces the solitary Salpa by ova. 1913 W. E. Kellicott Textbk. Gen. Embryol. iv. 162 The alternation between the sporophyte and gametophyte in ferns and mosses is truly an alternation of generations. 1948 Bull. Torrey Bot. Club 75 601 In plants showing alternation of generations, one generation can be secured (sometimes) by regeneration from the alternate generation. 2000 C. Tudge Variety of Life ii. vi. 212 Many cnidarians..have life cycles that include both polyps and medusae..and they are said to practise alternation of generations. < as lemmas |
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