Figure 3.

Main: Variation of total fixation probability P with deleterious effect $s_d$ for $U_d=u_d=0.9s_b$ (circles) and $1.1s_b$ (triangles), and $s_b=0.005$. Inset: Total fixation probability as a function of beneficial effect $s_b$ for $U_d=u_d=0.01$. In both figures, the numerical solution of (5) is shown by points, and the analytical result (9) by lines.