______________ occurs when a heterozygous combination of alleles is positively favoured even though a homozygous combination is disfavoured.

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This is a clear case of balancing selection, where heterozygotes have an advantage over homozygotes. This can happen in situations where different alleles have different advantages in different environments, or where heterozygotes have a fitness advantage due to some other factor such as resistance to disease.

______________ Occurs When a Heterozygous Combination of Alleles Is Positively