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Genetic variation
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== Maintenance in populations == A variety of factors maintain genetic variation in populations. Potentially harmful recessive alleles can be hidden from selection in the [[zygosity|heterozygous]] individuals in populations of [[ploidy|diploid]] organisms (recessive alleles are only expressed in the less common [[zygosity|homozygous]] individuals). Natural selection can also maintain genetic variation in balanced polymorphisms. Balanced polymorphisms may occur when heterozygotes are favored or when selection is frequency dependent.
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