| kenogenesis | <biology> Modified evolution, in which nonprimitive characters make their appearance in consequence of a secondary adaptation of the embryo to the peculiar conditions of its environment; distinguished from palingenesis. Alternative forms: caenogenesis. Origin: Gr. New + E. Genesis. Source: Websters Dictionary (01 Mar 1998) |
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| kenogenesis | introduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (as addition of the placenta in mammalian evolution) |
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