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metagenesis n. 世代交替 世代交替 metagenesis n 1: alternation of sexual and asexual generations [synonym: {metagenesis}, {digenesis}] Metagenesis \Met`a*gen"e*sis\, n. [Pref. meta- genesis.]
1. (Biol.) The change of form which one animal species undergoes in a series of successively produced individuals, extending from the one developed from the ovum to the final perfected individual. Hence, metagenesis involves the production of sexual individuals by nonsexual means, either directly or through intervening sexless generations. Opposed to {monogenesis}. See {Alternate generation}, under {Generation}. [1913 Webster] 2. (Biol.) Alternation of sexual and asexual or gemmiparous generations; -- in distinction from {heterogamy}. [1913 Webster]
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