Figure 4.

Selection at linked sites and the evolution of symmetrical incompatibilities. Linkage between epistatic and adaptive loci tends to decrease the probability of evolving symmetrical incompatibilities when adaptive loci are subject to directional or diversifying selection (panels in a and b, respectively), but increase the probability of evolving symmetrical incompatibilities when selection favors admixture (c). Results are shown for populations simulated with interlocus recombination rates of 0.5 (i.e., no linkage; left column of panels) or 0.1 (moderate linkage; right column of panels), m = 0.0001, and with different genetic architectures (panel rows). Note that genetic architecture is only relevant when r is less than .5. Refer to Figure S1 for results with m = 0.001