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The rate of adaptation, v, as a function of the population size N (Left) and the beneficial mutation rate Ub (Right) for the exponential (β = 1) and β = 10 distributions. Other parameters are N = 107, Ub = 10-5, and σ = 0.01. Symbols denote the results of forward-time Wright–Fisher simulations, and the solid lines are obtained by solving Eqs. 13 and 14 for β = 1 and Eqs. 18 and 19 for β = 10. For comparison, the predictions from clonal interference theory are plotted as dashed lines.
