Table 1

Parameters describing the fixation of beneficial mutations under each N _e. The number of lines that increased fitness is reported in the second column. The third column shows the number of generations elapsed until fixation of a beneficial mutation (8). A significant correlation between log N _e and the time to fixation has been observed (ρ_S = 0.75, n = 5, one-tailP = 0.0261). The last column shows the probability of fixation by random genetic drift (15).