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Figure 6.9 The strength of natural selection influences the rate of change in genotype and allele frequencies. In this illustration, selection acts against the recessive homozygote (aa). The top panel shows strong natural selection where viability of the aa genotype is 10-50% less than that of the other genotypes. The bottom panel shows weak natural selection where viability of the aa genotype is 1-0.1% less than that of the other genotypes. Note the vastly different time scales in the two plots.

1000 2000 3000 4000 5000 6000 7000 8000 9000 10,000 Generations

P, t equilibrium

Figure 6.9 The strength of natural selection influences the rate of change in genotype and allele frequencies. In this illustration, selection acts against the recessive homozygote (aa). The top panel shows strong natural selection where viability of the aa genotype is 10-50% less than that of the other genotypes. The bottom panel shows weak natural selection where viability of the aa genotype is 1-0.1% less than that of the other genotypes. Note the vastly different time scales in the two plots.

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