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nounintroduction during embryonic development of characters or structure not present in the earlier evolutionary history of the strain or species (such as the addition of the placenta in mammalian evolution)
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Words sounding like good kenogenesis
genesis spermatogenesis parthenogenesis xenogenesis autogenesis morphogenesis teratogenesis kenogenesis caenogenesis agamogenesis cytogenesis digenesis epigenesis blastogenesis neurogenesis palingenesis agenesis anagenesis anthropogenesis pathogenesis hematogenesis glycogenesis haematogenesis biogenesis heterogenesis gametogenesis ontogenesis oogenesis metagenesis monogenesis