Fig 2. Selection condition when a_G = r + σ_A, a_R = r − σ_A, b_G = 1 + σ_B, and b_R = 1 − σ_B.

The graph is bipartite, regular, and properly two-colored with N_G = N_R = 50. The difference between fixation probabilities of the two types, ρ_A − ρ_B, is shown for several values of σ_A and σ_B when r = 1.5. Warmer colors represent greater differences between the fixation probabilities, ρ_A − ρ_B. A is neutral relative to B if and only if $r^2-{\sigma }_A^2=1-{\sigma }_B^2$.