Chapter 28: Models of Evolution: Figure 28.12 - If heterozygotes have a selective advantage s over either homozygote, a stable polymorphism is maintained.

Figure 28.12 - If heterozygotes have a selective advantage s over either homozygote, a stable polymorphism is maintained.

Figure 28.12. If heterozygotes have a selective advantage s over either homozygote, a stable polymorphism is maintained. (A) The rate of change of allele frequency is dp/dT = –spq(p – q). There are unstable equilibria at p = 0, 1 (red dots) and a stable equilibrium at p = 0.5 (purple dot); arrows show the direction of allele frequency change. (B) Allele frequencies converge on the stable equilibrium (dashed line at p = 0.5). Time is scaled as T = st.

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