Figure 3.

Accuracy of the analytic approximation for weak to moderate selection. Percentage of error, calculated as (P_approx − P_exact)/(P_exact − P^C), is plotted as a function of the strength of selection (s) for five types of hybrid incompatibility: autosome–autosome (A–A), autosome–X (A–X), autosome–Y (A–Y), X–X, and X–Y. Exact values were obtained from four-locus simulations. The strengths of migration (m), natural selection on the male trait (s_T), and sexual selection (α) were varied as a function of s, where m = s/80, s_T = s, α = 2s. The strength of selection on hybrid incompatibility also varied as a function of s, where s₀₀ = 0, s₁₁ = s/4, s₀₁ = s₁₀ = s₁₂ = s₂₁ = s/2, s₀₂ = s₂₀ = s.