overdominance

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overdominance

[¦ō·vər′däm·ə·nəns]
(genetics)
Monohybrid heterosis, that is, the phenotype is being more pronounced in the heterozygote than in either homozygote with respect to a specified pair of alleles.
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References in periodicals archive ?
Allelic genealogy under overdominant and frequency- dependent selection and polymorphism of major histocompatibility complex loci.
This was a better performance than the Beethoven much bolder and more decisive and with more character, although the piano was perhaps a little overdominant.
Their study indicates the presence of an overdominant autosomal major gene affecting litter size in Baluchi sheep.