Genetic Drift
        in duplicate populations

Genetic Drift of neutral alleles
(f(B)(0) = 0.5, N = 50, W0 = W1 = W2)

    In the absence of natural selection, the frequency f(B) of an allele is subject only to random genetic drift. Replicate populations with N = 50 drift from an identical initial f(B) = 0.5 to fixation and loss, respectively, in 100 ~ 200 generations. Note that in one population f(B) drifts to q < 0.1 before drifting to fixation, while the other drifts twice to q > 0.5 prior to loss. The trajectories are random: careful inspection would show that the count of positive and negative changes of f(B) over time are about equal, whereas the magnitude of dq in either is normally distributed.


Text material © 2024 by Steven M. Carr