e·pis·ta·sis ( -ps t -ss)n. pl. e·pis·ta·ses (-s  z ) 1. A film that forms over the surface of a urine specimen. 2. An interaction between nonallelic genes, especially an interaction in which one gene suppresses the expression of another. 3. The suppression of a bodily discharge or secretion. ep i·static ( p-st tk) adj. |
epistasis
[epis′təsis]
Etymology: Gk, a standing
1 suppression of a secretion or excretion, as of blood, menses, or lochia.
2 an interaction between genes at different loci in which one gene masks or suppresses the expression of the other. Epistasis, which is nonallelic and therefore different from dominance, may be caused by the presence of homozygous recessive alleles at one gene pair, as occurs in the Bombay phenotype, or by the presence of a dominant allele at one locus that counteracts the expression of a dominant allele at the other locus. Compare dominance. epistatic, adj.
epistasis,
n gene interaction where a gene at a particular locus supercedes or obscures the expression of another gene at a different locus.
epistasis
non-allelic masking of one gene by another, e.g. the masking of the black gene by the orange gene in tortoiseshell cats.
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