Fig. 2.

Examples of the critical selfing rate for genes expressed in the sporophyte phase only. Results are derived from equation (3). In a), the critical selfing rate increases with homozygotic selection ($s_{\mathrm{hom}}$) under a constant heterozygotic selection ($s_{\mathrm{het}}=-0.001$). In b), the critical selfing rate decreases with heterozygotic selection ($s_{\mathrm{het}}$) under a constant homozygotic selection ($s_{\mathrm{hom}}=-0.0002$). In a and b), the critical selfing rate has a positive relationship with the mutation rate ($\mu ={10}^{-5}$ and 10⁻⁴).