Figure P17.9. Mean fitness as a function of allele frequencies p_A, p_B. Contours are at intervals of = 0.05 and run from 0 at top right (dark) up to 1.1 at top left and bottom right. (Blue lines) Evolution of populations that start with roughly equal allele frequencies (center), and low fitness ( = 0.8) up to fixation for either A^P (bottom right) or B^P (top left), with mean fitness = 1.1.

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