balanced polymorphism


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balanced polymorphism

[′bal·ənst ¦päl·i′mȯr‚fiz·əm]
(genetics)
Maintenance in a population of two or more alleles in equilibrium at frequencies too high to be explained, particularly for the rarer of them, by mutation; commonly due to the selective advantage of a heterozygote over both homozygotes.
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References in periodicals archive ?
One indication of a balanced polymorphism is a higher rate of nonsynonymous than synonymous substitution (8).
We use our intelligence to disentangle the good-evil mix of a balanced polymorphism of this sort.
Racial variability in the UDP-glucuronosyltransferase 1 (UGTIA1) promoter: a balanced polymorphism for regulation of bilirubin metabolism?

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