| 释义 |
monomorphic, a.|mɒnəʊˈmɔːfɪk|
[Formed as monomorphous a. + -ic.]
= monomorphous a. Now spec. in Genetics, identical as regards genotype, a particular chromosome, or a part of a chromosome.
1880Webster Suppl. 1894–1900G. M. Gould Dict. Med. (ed. 5), Monomorphic, in biology: (a) applied to a collection of individuals, exhibiting similarity or identity of form; (b) applied to species in which the same forms recur one after another with comparatively insignificant individual character. 1894W. Bateson Materials for Study of Varieties 37 The..case in which the whole community, grouped according to the degrees in which they display a given character, forms one Curve of Error, may conveniently be called monomorphic in respect of that character. 1895Cambr. Nat. Hist. V. 498 This species [of Hymenoptera] is said to be monomorphic. 1957Cold Spring Harbor Symp. Quantitative Biol. XXII. 397/2 A highly polymorphic population..will be able..to leave progeny of some sort in a wider range of environment than could a monomorphic one. 1960Proc. Nat. Acad. Sci. XLVI. 41 The population fails to reach the level of adaptedness which it would have if it were monomorphic for a genotype with an adaptive value equal to that of the A1A2 heterozygotes. Suppose, then, that a mutation produces an allele A3 such that the fitness of the homozygote A3A3 is equal to that of the heterozygote A1A2. Natural selection is expected to lead to gradual elimination of A1 and A2, and to establishment of a population monomorphic and homozygous for A3A3. 1971Nature 17 Sept. 190/2 D. simulans is one of the three widespread species of Drosophila considered to be monomorphic with regard to chromosome structure. 1973Ibid. 31 Aug. 574/2 Of the thirty-one loci examined eight are monomorphic in all eleven populations. 1974Ibid. 11 Oct. 514/1 T. vivax is generally considered monomorphic, although evidence of morphological variation between strains has been reviewed recently. |