overdominancen.

Brit.

/ˌəʊvəˈdɒmᵻnəns/, U.S.

/ˌoʊvərˈdɑmənəns/

Origin: Formed within English, by derivation. Etymons: over- prefix, dominance n.

Etymology: < over- prefix + dominance n.

1. Excessive dominance.

ΚΠ

1916 J. Grunzel Econ. Protectionism 327 Wishing to accentuate the already existing overdominance of the economically strong.

1947 Amer. Sociol. Rev. 12 121/1 Over-inhibited behavior patterns..show a high correlation..with parental over-dominance.

1991 Economist 16 Nov. 6 We are very afraid of the political problems created by the over-dominance of Japanese business in some Asian markets.

2. Genetics. A condition in which a heterozygote (having a copy of two different alleles of a gene) has a phenotype which falls beyond the extremes of the range represented by the corresponding homozygotes (having two copies of one or other of the alleles).

ΚΠ

1946 F. H. Hull in Genetics 31 219 Failure of ear-row selection and Fn of multiple crosses of selected lines are inconsistent with classical dominance theory of heterosis but not with a theory of overdominance.

1960 Farmer & Stockbreeder 1 Mar. 65/1 From a geneticist's point of view in-breeding deterioration is explained by a decrease in those combinations showing overdominance.

1998 Evolution 52 1084/1 The size traits (wings and legs) showed a consistent pattern of overdominance as the hybrids had mean phenotypic values higher than both parents.

This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022).

单词	overdominance
释义	overdominancen. Brit. /ˌəʊvəˈdɒmᵻnəns/, U.S. /ˌoʊvərˈdɑmənəns/ Origin: Formed within English, by derivation. Etymons: over- prefix, dominance n. Etymology: < over- prefix + dominance n. 1. Excessive dominance. ΚΠ 1916 J. Grunzel Econ. Protectionism 327 Wishing to accentuate the already existing overdominance of the economically strong. 1947 Amer. Sociol. Rev. 12 121/1 Over-inhibited behavior patterns..show a high correlation..with parental over-dominance. 1991 Economist 16 Nov. 6 We are very afraid of the political problems created by the over-dominance of Japanese business in some Asian markets. 2. Genetics. A condition in which a heterozygote (having a copy of two different alleles of a gene) has a phenotype which falls beyond the extremes of the range represented by the corresponding homozygotes (having two copies of one or other of the alleles). ΚΠ 1946 F. H. Hull in Genetics 31 219 Failure of ear-row selection and Fn of multiple crosses of selected lines are inconsistent with classical dominance theory of heterosis but not with a theory of overdominance. 1960 Farmer & Stockbreeder 1 Mar. 65/1 From a geneticist's point of view in-breeding deterioration is explained by a decrease in those combinations showing overdominance. 1998 Evolution 52 1084/1 The size traits (wings and legs) showed a consistent pattern of overdominance as the hybrids had mean phenotypic values higher than both parents. This entry has been updated (OED Third Edition, December 2004; most recently modified version published online March 2022). < n.1916
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