Figure 1

Effects of X₁A₂ unidirectional sex-biased incompatibility on genetic load (L) in a deme that receives 0.5:0.5 contributions from parental populations (H₁:H₂). (a) A scenario under an X₁A₂ unidirectional sex-biased incompatibility. The L is relative to the initial fitness (W⁽⁰⁾=1) of the deme, in which L≈0.867 for a heterogametic incompatibility and L≈0.982 for a homogametic incompatibility. (b) A scenario under compound (X₁A₂+X₂B₁) bidirectional sex-biased incompatibilities in which L≈0.999621 for a compound heterogametic incompatibility and L≈0.999889 for a compound homogametic incompatibility. ht incomp, heterogametic incompatibility; ho incomp, homogametic incompatibility.