balanced polymorphism

(redirected from stable polymorphism)
Also found in: Medical.

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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