overdominantadj.

1937 Science 4 June 531/1 With an over-dominant financial- and promotional-minded management, he may..be under considerable pressure to focus these service efforts..with a single eye to increase profits and decrease costs.

1959 G. Freyre New World in Tropics Introd. 22 A tropical point of view complementary to the European or boreal one that has been overdominant in science and technology.

1988 Times (Nexis) 29 Mar. Consistency and a recognizable house-style usually come from an over-dominant teacher and over-obsequious pupils.

1954 I. M. Lerner Genetic Homeostasis xiii. 66 It should be possible to reach high levels of homozygosity by maintaining only the overdominant loci in a heterozygous state.

1980 Evolution 34 862/1 Given the requirement that the null homozygote be lethal, frequencies as high as these can be maintained in the population only if either the mutation rate to null alleles is very high..or if null alleles are overdominant for viability.

2000 D. A. Levin Origin, Expansion, & Demise Plant Species iii. 43 This trait is influenced by eight QTLs [= quantitative trait loci]; gene action in four is additive, in two is dominant, in one is recessive, and in one is overdominant.