| 释义 |
sexual generation
sex′ual genera`tion
n. the gametophyte generation in the alternation of generations in plants that produces a zygote from male and female gametes. [1875–80] EncyclopediaSeegenerationsexual generation
generation [jen″er-a´shun] 1. the process of reproduction.2. a class composed of all individuals removed by the same number of successive ancestors from a common predecessor, or occupying positions on the same level in a genealogical (pedigree) chart.alternate generation reproduction by alternate asexual and sexual means in an animal or plant species.asexual generation (direct generation) production of a new organism not originating from union of gametes.first filial generation the first-generation offspring of two parents; symbol F1.parental generation the generation with which a particular genetic study is begun; symbol P1.second filial generation all of the offspring produced by two individuals of the first filial generation; symbol F2.sexual generation production of a new organism from the cell formed by the union of a male gamete (spermatozoon) and a female gamete (oocyte).spontaneous generation the discredited concept of continuous generation of living organisms from nonliving matter.sex·u·al gen·er·a·tionreproduction by conjugation, or the union of male and female cells, as opposed to asexual generation.sex·u·al gen·er·a·tion (sek'shū-ăl jen'ĕr-ā'shŭn) Reproduction by conjugation, or the union of male and female cells, as opposed to asexual generation. |