theory of epigenesis

theory of epigenesis
theory of epigenesis n a theory in biology: development involves differentiation of an initially undifferentiated entity

Medical dictionary. 2011.

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  • theory of epigenesis — a theory in biology: development involves differentiation of an initially undifferentiated entity …   Useful english dictionary

  • Epigenesis (biology) — In biology, epigenesis has at least two distinct meanings: * the unfolding development in an organism, and in particular the development of a plant or animal from an egg or spore through a sequence of steps in which cells differentiate and organs …   Wikipedia

  • epigenesis — 1. Development of offspring from a zygote. Cf.:preformation theory. 2. Regulation of the expression of gene activity without alteration of genetic structure. [epi + G. genesis, creation] * * * epi·gen·e·sis .ep ə jen ə sə …   Medical dictionary

  • Epigenesis — Ep i*gen e*sis, n. [Pref. epi + genesis.] (Biol.) The theory of generation which holds that the germ is created entirely new, not merely expanded, by the procreative power of the parents. It is opposed to the theory of {evolution}, also to… …   The Collaborative International Dictionary of English

  • epigenesis — [ep΄i jen′ə sis] n. [ModL: see EPI & GENESIS] 1. Biol. the theory that the embryo, influenced by its internal and external environment, develops progressively by stages, forming structures that were not originally present in the egg: cf.… …   English World dictionary

  • epigenesis — theory of embryonic development Causation and Formation …   Phrontistery dictionary

  • epigenesis — n. [Gr. epi, upon; genesis, beginning] The theory that morphological complexity develops gradually from an essentially formless egg during embryology; during the 18th and 19th century debates, epigenesis represented the theory that complexity… …   Dictionary of invertebrate zoology

  • epigenesis — noun Etymology: New Latin Date: 1798 1. development of a plant or animal from an egg or spore through a series of processes in which unorganized cell masses differentiate into organs and organ systems; also the theory that plant and animal… …   New Collegiate Dictionary

  • epigenesis — The theory that development is a process of gradual increase in complexity as opposed to the preformationist view that supposed that mere increase in size was sufficient to produce adult from embryo …   Dictionary of molecular biology

  • epigenesis — epigenesist, epigenist /i pij euh nist/, n. epigenetic /ep i jeuh net ik/, adj. epigenetically, adv. /ep i jen euh sis/, n. 1. Biol. a. the theory that an embryo develops from the successive differentiation of an originally undifferentiated… …   Universalium

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