Timing of Coalescence, Recombination, and Mutation Events during the Selective Phase in a Sample of Two

<p>This plot shows the probability that recombination (reco), mutation (mut), or coalescence (coal) happens during the selective phase when we trace the ancestry of a sample of size 2 back in time. The parameter values for this plot are chosen so that the timing of the three events is made clear; no importance should be given to the relative heights of the curves. The curve with label <i>x_τ</i> shows the frequency of the <i>B</i> allele in the population.