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epigenesis
epigenesis Epigenesis is the view that, during embryonic development, structures and traits are newly produced as differentiation proceeds rather than simply unfolding from forms already present in the germ.
Epigenesis is the view that, during embryonic development, structures and traits are newly produced as differentiation proceeds rather than simply unfolding from forms already present in the germ. It is contrasted with preformation, which holds that these characters were already there in miniature or fixed form.