Mean population
fitness in the case of Heterozygote
Advantage
Mean population fitness in the
case of heterozygote advantage increases to a
maximum at . The rate of change slows as the equilibrium
is approached from above or below [derivative
dW/dp = 0].
[The red circles show two trivial exceptions: if p = 0
or 1, there is no variation and an
equilibriumcannot
be reached].