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Figure 3 | BMC Evolutionary Biology

Figure 3

From: Similar rates of protein adaptation in Drosophila miranda and D. melanogaster, two species with different current effective population sizes

Figure 3

The frequency of adaptive mutations ( U ) versus their strength, for large and small populations. Assuming a fixed distribution of selective effects of mutations (s), large populations will have fewer effectively neutral mutations un (light grey area) but more beneficial mutations uben (dark grey area), than smaller populations. The mean effect of a beneficial that can become fixed in the species will be larger in a smaller population.

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