Figure 7.

Relation between $F_{ST}$ under neutrality and balancing selection. The black line indicates F${}_{\text{ST}}$neutral = F${}_{\text{ST}}$selection. (A) daughter populations remain under the same regime of overdominance as the ancestral population (shared overdominance). (B) One of the daughter populations experiences a shift in the fitness values (divergent overdominance), remaining under overdominance but with a new equilibrium value (changed by a value of $\delta =0.2$). Under divergent overdominance, for recent divergence times we find balancing selection can transiently increase population differentiation, so long as selection is strong (s = 0.05 or greater, $N_e=1000$).