Chapter 28: Models of Evolution: Figure 28.13 - A stable polymorphism (purple dot) can be maintained when selection favors allele P in deme 2 but acts against it in deme 1.

Figure 28.13 - A stable polymorphism (purple dot) can be maintained when selection favors allele P in deme 2 but acts against it in deme 1.

Figure 28.13. A stable polymorphism (purple dot) can be maintained when selection favors allele P in deme 2 but acts against it in deme 1. There are also two equilibria, corresponding to fixation of allele Q or allele P in both demes (red dots). The diagram shows how populations converge on the stable equilibrium (black lines). The green arrows show the leading eigenvectors at the equilibria: Populations tend to move away from the unstable equilibria, and toward the stable equilibrium, along these special directions. (M = m/s = 0.5.)

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