Fig. 7

Many loci of small effect require stronger selection than a a single locus of large effect to evolve blindness in the face of immigration. a The equilibrium frequencies of the blindness allele for an infinite population with a single locus and b average frequencies of the allele after t generations in finite populations of size N (100 replicates). c and d The impact of multiple loci (k=12) on the evolution of blindness. Colors correspond to the frequency of the blindness allele (b) for a given combination of selection (s) and migration (m), where blue is high frequency (blindness evolved) and red is low (blindness did not evolve). The solid white lines correspond to \(s^{*}_{0.5}\) for k=1 or 12 and the dashed lines correspond to \(s^{*}_{0.5}\) for k=1