Fig. S2.

Compatibility of F₁ hybrid pollen (i.e., $x$ = 0.5) with the ovules of various genotypes as predicted by Eq. S15 for three $\beta$ values. When $\beta$ is larger than 1 (here, $\beta$ = 3; blue), the hybrid is more compatible (i.e., more likely to produce viable offspring) with the incoming genotype, whereas it has lower compatibility with the resident genotype. When $\beta$ is smaller than 1 (here, $\beta$ = 0.2, red), the opposite is true, whereas for $\beta$ = 1 (green), all genotypes exhibit the same level of compatibility with the hybrid. In this example, the compatibility of the two pure parental genotypes, $\alpha$, was set at 0.5.