Figure 6.8 The change in the genotype and allele frequencies when there is overdominance for fitness and natural selection favors individuals with Aa genotypes. From any initial allele frequency the population converges on a maximum frequency of heterozygotes. This corresponds to equal allele frequencies with random mating. The colored, dashed line in the bottom panel corresponds to the allele frequencies in the top panel. In this illustration wAA = wa. Genotype frequencies assume random mating.

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