Figure 6. Polymorphic disruptive mutations are common.

Summaries for the counts and fraction of the chemosensory families that have null mutations segregating at frequencies ≥10% in the populations. (a) The fraction of the gene families that harbour null alleles segregating at ≥10% in the populations. B, Beijing; I, Ithaca; N, Netherlands; T, Tasmania, Z, Zimbabwe. (b) Counts of genes that contain either no high-frequency null mutations across the five populations or contain high-frequency mutations in all five populations.