| 释义 |
epistatic, a. Genetics.|ɛpɪˈstætɪk|
[prob. f. epi- + Gr. στάσις standing, position, state, after hypostatic a., hypostasis; but cf. Gr. ἐπιστάτης one who is set over (see epistates), ἐπιστασία dominion; a derivation directly from ἐπιστάτικος of government, (also) standing still, or from ἐπίστασις epistasis is unlikely.]
Of, exhibiting, or caused by epistasis (sense 2). Const. to, on, over. (Opp. to hypostatic a. 3.)
1907W. Bateson in Science 15 Nov. 653/2 Till lately we spoke of the relations between the gray color of the mouse to the black color in terms of dominance. Those terms, strictly speaking, should only be applied to members of the same allelomorphic pair. We can perhaps best express the relation between the gray and the black by the use of the metaphor ‘higher and lower’, and I therefore suggest the term epistatic as applicable to characters which have to be, as it were, lifted off in order to permit the lower or hypostatic character to appear. 1909― Mendel's Princ. Heredity ii. 41 (Primula). The magenta shades have a factor epistatic to crimson and pink. Ibid. v. 98 The pale ivory is due to a factor epistatic on the bright yellow. 1910L. Doncaster Heredity vi. 75 The presence of a higher member of the series obscures or prevents the development of the lower. This is expressed by saying that grey is ‘epistatic’ over black and chocolate, and black over chocolate. 1949Darlington & Mather Elements of Genetics vii. 157 A gene removing an organ is..obviously epistatic to one modifying that organ. 1968M. W. Strickberger Genetics xv. 239 Epistatic or interaction effects are also known..in which the phenotypic expression caused by one pair of genes depends upon alleles at another gene pair. |