Figure 6

The distribution of allele frequencies (P) across a hybrid zone that consists of a chain of demes with gradually changing H₁:H₂ contributions ranging from 1:0 to 0:1 in the presence of compound bidirectional X₁A₂+X₂B₁ sex-biased hybrid incompatibility. ht incomp, heterogametic incompatibility; ho incomp, homogametic incompatibility.