epigenesis /epi·gen·e·sis/ (-jen´ĕ-sis) the development of an organism from an undifferentiated cell, consisting in the successive formation and development of organs and parts that do not preexist in the fertilized egg.epigenet´ic
epigenesis
ep·i·gen·e·sis ( p  -jn  -ss)n. The theory that an individual is developed by successive differentiation of an unstructured egg rather than by a simple enlarging of a preformed entity. ep i·ge·netic (-j-ntk) adj. |
epigenesis
[ep′ijen′əsis]
Etymology: Gk, epi + genein, to produce
(in embryology) a theory of development in which the organism grows from a simple to more complex form through the progressive differentiation of an undifferentiated cellular unit. Compare preformation. epigenesist, n., epigenetic, adj.
epigenesis
the development of an organism from an undifferentiated cell, consisting in the successive formation and development of organs and parts that do not preexist in the fertilized egg.
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