Figure 6.

The sojourn probability P_soj(k|x₀) plotted for different values of x₀, q, and other population parameters U_b, s, and N. Curves represent the theoretical prediction for the sojourn times given in Equation 29. Circles and squares represent the results of forward-time simulations. The circular and square points have identical values of q, but differ in population size by a factor of 10. Circles represent simulations run with parameters s = 0.1, U_b = 0.001, and squares are run with parameters s = 0.01, U_b = 0.0001. The three plots represent different values of q, with q = 4 calculated from the approximate value in the text, and q = 6.8, 8 calculated with higher-order corrections given in Desai and Fisher (2007). For both simulated and theoretical curves, mutations were considered extinct or fixed in a given class when they fell below or rose above a cutoff of ε = 0.03 or (1 − ε) = 0.97, respectively. More information about the simulations may be found in File S1.