Results from a two-locus, two-allele run of the simulation in which a rare mutant for OA mate choice was introduced into a CD population of 20,000 individuals. At host generation 200, the mutation rate between CD and OA was set at 0.000001 per individual per generation. (a). Once established, the OA allele spread rapidly until it reached a frequency of about 0.5 in the population. (b) Frequency of the 1,1 host genotype. Note the rapid attenuation of cycling which accompanied the spread of the OA allele into the population.