Answer | Crossword Clue |
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epigenesis | The theory, now generally held, that an embryo develops progressively from an undifferentiated egg cell |
epigenist | a. the theory that an embryo develops from the successive differentiation of an originally undifferentiated structure b. the approximately stepwise process by which genetic information, as modified by environmental influences, is translated |
preformation | The theory, now discarded, that an embryo develops from a complete miniature version of the organism |