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| Description: Table 20.5 A Model of Natural Selection Favoring the Heterozygous Genotype Genotype CC Cc cc Frequency 0.25 0.50 0.25 Relative fitness 0.65 1.0 0.20 Survivors after 0.1625 0.50 0.05 selection (total = 0.7125) Relative genotype 0.1625/ 0.50/ 0.05/ frequencies 0.7125 = 0.7125 = 0.7125 = 0.228 0.702 0.070 New allele frequencies after natural selection: f(C) = 0.579 f(c) = 0.421 Genotype frequencies after reproduction: f(CC) = (0.579)2 = 0.335 f(Cc) = 2[(0.579)(0.421)] = 0.448 f(cc) = (0.421)2 = 0.177
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