Fig. 1 | Heredity

Fig. 1

From: Frequency of insularia during the decline in melanics in the peppered moth Biston betularia in Britain

Fig. 1

Relation of frequency of the insularia allele (q) to that of the carbonaria allele (p) in populations which also include the typical allele (frequency of typical = 1 − p − q). Fitnesses of carbonaria, insularia and typica are 1 − s, 1 and 1 + s. Solid line: Δq=0. Pecked lines: trajectories for populations moving towards p=0, q=0, starting from the same value of q but different values of p and r. With this model the paths of the trajectories do not depend on s.

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