Figure 3.

The opportunity for polymorphism with parentally antagonistic selection at both loci. The area of parameter space that allows polymorphism at linked parentally antagonistic loci expands with stronger selection and reduced recombination. The axes in each plot are the scaling parameters, a and b, which determine where between the heterozygous extremes the homozygote fitnesses fall. Low values of a and b correspond to relatively high fitness of the homozygotes. For each value of s and r, we simulated 10 000 combinations of a and b. The coloured space represents populations that achieved a polymorphic equilibrium with those values for a and b.