Genome-wide distribution of F_ST. Solid bars show the observed distribution of F_ST for 25,549 autosomal SNPs. The X chromosome was not included in this analysis because it has a different effective population size compared with that of autosomal markers. Lightly shaded bars represent the simulated distribution of F_ST. The inset figure shows the observed and simulated distributions of F_ST for values ≥0.5.