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Figure 8.2 The fate of selectively neutral mutations in a population. New mutations enter the population at rate and an initial frequency of -1. Allele frequency is a random walk determined by genetic drift. The time that a new mutation segregates in the population, or the dwell time of a mutation, depends on the effective population size. However, the chance that a new mutation goes to fixation (equal to its initial frequency) is also directly related to the effective population size. These two effects of the effective population size cancel each other out for neutral alleles. The neutral theory then predicts that the rate of fixation is and therefore the expected time between fixations is 1/|i generations. For that subset of mutations that eventually fix, the expected time from introduction to fixation is 4Ne generations. After Figure 3.1 in Kimura (1983a).

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