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Frequency of A allele (p)

Figure 7.5 The relative fitness of each genotype (wxx) and the change in allele frequency (Ap) across all frequencies of the A allele under frequency-dependent natural selection. There is a stable equilibrium point at p = 0.5 in this particular case, even though the heterozygote has the lowest fitness. Two unstable equilibria at fixation and loss are marked with open circles. Here the relative fitness values are

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