English definition of Metagenesis

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Definition of metagenesis

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Metagenesis (n.) 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..

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Parthenogenesis :: Parthenogenesis (n.) The production of new individuals from virgin females by means of ova which have the power of developing without the intervention of the male element; the production, without fertilization, of cells capable of germination. It is one of the phenomena of alternate generation. Cf. Heterogamy, and Metagenesis..

Heterogamy :: Heterogamy (n.) That form of alternate generation in which two kinds of sexual generation, or a sexual and a parthenogenetic generation, alternate; -- in distinction from metagenesis, where sexual and asexual generations alternate..

Strobile :: Strobile (n.) An individual asexually producing sexual individuals differing from itself also in other respects, as the tapeworm, -- one of the forms that occur in metagenesis..

Monogenesis :: Monogenesis (n.) The direct development of an embryo, without metamorphosis, into an organism similar to the parent organism; -- opposed to metagenesis..

Metagenetic :: Metagenetic (a.) Of or pertaining to metagenesis.

Metagenesis :: Metagenesis (n.) 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..

Metagenesis :: Metagenesis (n.) Alternation of sexual and asexual or gemmiparous generations; -- in distinction from heterogamy.