Figure 2From: Sexual selection and the evolution of obligatory sexThe quantitative effect of sexual selection on fixation of an allele for obligatory sex. Plot of the critical genome mutation rate (U) above which obligatory sex fixes in a facultative population, as a function of the strength of sexual selection (χ). Contour lines with different costs of sex C sex = 0.1,0.2, 0.3, 0.4, and 0.5 are shown. The white area above the C sex = 0.5 contour is the parameter range in which obligatory sex fixes even with a two-fold cost of sex. The plot was generated using a = 0.99, s = 0.05, and N = 50, with free recombination. Fixation of the allele O was defined as reaching a frequency higher than 99.9% within 2500 generations.Back to article page