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Answer for the clue "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) ", 11 letters:
kenogenesis

Word definitions for kenogenesis in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
cenogenesis \cen`o*gen"e*sis\ n. [Gr. ? new + E. genesis.] (Biol.) The 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 ...

Wiktionary Word definitions in Wiktionary
n. (alternative form of caenogenesis English)

WordNet Word definitions in WordNet
n. 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) [syn: cenogenesis , caenogenesis , cainogenesis , kainogenesis ...