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Mean population fitness in the case of Heterozygote Advantage

Mean population fitness increases to a maximum at . The rate of change slows [derivative dW/dp = 0] as the equilibrium is approached. [The red circles indicate two trivial exceptions: if p = 0 or 1, there is no variation and no equilibrium  to be reached].


Figure © 2019 Sætre & Ravinet; Text material © 2019 by Steven M. Carr