epigenesis

(redirected from Epigenesist)
Also found in: Dictionary, Thesaurus, Encyclopedia.

epigenesis

 [ep″ĭ-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 zygote. adj., adj epigenet´ic.

ep·i·gen·e·sis

(ep'i-jen'ĕ-sis),
1. Development of offspring from a zygote. Compare: preformation theory.
2. Regulation of the expression of gene activity without alteration of genetic structure.
[epi- + G. genesis, creation]

epigenesis

(ĕp′ə-jĕn′ĭ-sĭs)
n.
1. Biology The theory that an individual is developed by successive differentiation of an unstructured egg rather than by a simple enlarging of a preformed entity.
2. Geology Change in the mineral content of a rock because of outside influences.

ep·i·gen·e·sis

(ep'i-jen'ĕ-sis)
1. Development of offspring from a zygote.
2. Regulation of the expression of gene activity without alteration of genetic structure.
[epi- + G. genesis, creation]

epigenesis

the formation of entirely new structures during the development of the EMBRYO.