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balanced polymorphism

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n.

A system of genes in which two alleles are maintained in stable equilibrium because the heterozygote is more fit than either of the homozygotes.

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The rainy weather could not ________ my elated spirits on my graduation day.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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