1. The formation of a pellicle or scum on the surface of a liquid, especially as on standing urine. 2. Phenotypic interaction of non-allelic genes. 3. A form of gene interaction whereby one gene masks or interferes with the phenotypic expression of one or more genes at other loci; the gene whose phenotype is expressed is said to be “epistatic,” while the phenotype altered or suppressed is then said to be “hypostatic.” SYN: epistasy. [G. scum; epi- + G. stasis, a standing]

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epis·ta·sis i-'pis-tə-səs n, pl -ta·ses -.sēz
1 a) suppression of a secretion or discharge
b) a scum on the surface of urine
2) suppression of the effect of a gene by a nonallelic gene <the role of \epistasis in polygenic inheritance>

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1. the stopping of a flow or discharge, as of blood.
2. a type of gene action in which one gene can suppress the action of another (nonallelic) gene. The term is sometimes used for any interaction between nonallelic genes.
epistatic adj.

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epis·ta·sis (ə-pisґtə-sis) [epi- + stasis] 1. suppression of a secretion or excretion, as of blood, menses, or lochia. 2. a scum on the surface of urine. 3. the interaction between genes at different loci that results in one gene masking the expression of the other. Cf. dominance.

Medical dictionary. 2011.

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Look at other dictionaries:

  • epistasis — medical Latin, from Gk. epistasis “a stopping, stoppage,” from epi “upon” (see EPI (Cf. epi )) + stasis “a stopping or standing” (see STASIS (Cf. stasis)) …   Etymology dictionary

  • epistasis — epistasis. См. эпистаз. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • epistasis — (en genética) tipo de interacción entre genes de diferentes loci de un cromosoma en el que uno puede enmascarar o suprimir la expresión de otro. Diccionario Mosby Medicina, Enfermería y Ciencias de la Salud, Ediciones Hancourt, S.A. 1999 …   Diccionario médico

  • epistasis — [ē pis′tə sis] n. [ModL < Gr, a stopping < ephistanai, to stop, orig. to place upon < epi , EPI + histanai, to STAND] Genetics the suppression of gene expression by one or more other genes …   English World dictionary

  • Epistasis — See Epistaxis for the condition known colloquially as a nosebleed. See Epitasis for the main action of a classical drama. See Epitaxy for the method of depositing a monocrystalline film on a monocrystalline substrate. See also: Quantitative Trait …   Wikipedia

  • epistasis — epistatic /ep euh stat ik/, adj. /i pis teuh sis/, n., pl. epistases / seez /. 1. Genetics. a form of interaction between nonallelic genes in which one combination of such genes has a dominant effect over other combinations. 2. Med. a. the… …   Universalium

  • epistasis — epistazė statusas T sritis augalininkystė apibrėžtis Nealelinių genų sąveika, kurios metu vieni genai slopina kitų veikimą. atitikmenys: angl. epistasis rus. эпистаз ryšiai: sinonimas – epistazinė genų sąveika sinonimas – inhibicija …   Žemės ūkio augalų selekcijos ir sėklininkystės terminų žodynas

  • epistasis — Interaction between genes at different loci, e.g. one gene suppresses the effect of another gene that is situated at a different locus. Dominance is associated with members of allelic pairs, whereas epistasis describes an interaction among… …   Glossary of Biotechnology

  • epistasis — noun (plural epistases) Etymology: New Latin, from Greek, act of stopping, from ephistanai to stop, from epi + histanai to cause to stand more at stand Date: circa 1917 suppression of the effect of a gene by a nonallelic gene • epistatic… …   New Collegiate Dictionary

  • Epistasis — Epistase (Griechisch für bremsen, stoppen) ist eine Form der Gen Interaktion. Sie liegt vor, wenn ein Gen die Unterdrückung der phänotypischen Ausprägung eines anderen Gens bewirken kann. Der Begriff wurde im Jahre 1909 von William Bateson… …   Deutsch Wikipedia

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