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Generation

Figure 3.4 The results of genetic drift with different initial allele frequencies. The two panels have identical population sizes (N = 25) but initial allele frequency is p = 0.2 on the right and p = 0.8 on the left. The chances of fixation are equal to the initial allele frequency, a generalization that can be seen by examining a large number of replicates of genetic drift. Consistent with this expectation, more replicates go to loss on the left and more reach fixation on the right. Even with the difference in initial allele frequencies, the random trajectory of allele frequencies is apparent.

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