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Figure 23. Overdominance leads to stabilizing selection that maintains both alleles in a population. A) The allele frequency converges to an equilibrium value irrespective of the initial frequency. In the example, w11 = 0.9, w12 = 1 and w22 = 0.8 and the equilibrium frequency of allele A is 0.667. B) The average population fitness for different frequencies of the A allele (p). |