Positive assortative mating increases the proportion of heterozygotes in a population.

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In positive assortative mating, individuals prefer to mate with individuals similar to themselves. Thus, AA would be more likely to mate with AA, and aa would be more likely to mate with aa. This results in an increase in the proportion of homozygotes in the population and a decrease in the proportion of heterozygotes. Negative assortative mating has the opposite effect.

Positive Assortative Mating Increases the Proportion of Heterozygotes in a Population