Figure 7

The configuration of the stable and unstable equilibrium in the phase space for d = 1 . The high-frequency unstable equilibrium and stable equilibrium were determined numerically for d=1 over a range of fitness values. In the shaded region an unstable equilibrium exists within the interior of the simplex. In the meshed region a stable equilibrium exists on the M+ to MM edge of the simplex The non-mesh region corresponds to underdominance. The dark diagonal line denotes an ideal unstable threshold in terms of ease of populations transformation and reversal ($\widehat{x}+ŷ/2=1/2$) (see Appendix). Disks indicate the positions of results plotted in Figure 2 for the ‘Medea only’ system (M) and the combined system (C).