Figure 7.9 The absolute value of the change in allele frequency due to mutation (Aqmutatlon) and due to natural selection (Aqselectlon) when there is selection against a recessive homozygote. Mutation continually makes new copies of the recessive allele while selection continually works toward loss of the recessive allele. The equilibrium allele frequency occurs when the processes of mutation and selection exactly counteract each other. Here s = 0.1 and = 1 x 10-6 so the expected equilibrium is

^equilibrium = °.°032 as shown W the vertical arrow.

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