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Genetic draft dramatically reduces fixation times and the efficacy of selection. (A) Mean fixation times Tfix of neutral mutations, normalized by the population size N, as a function of r/σ for different N. For r/σ < 1, Tfix increases only slowly (sublinear) with N. (B) The fixation probability of beneficial and deleterious mutations relative to that of neutral mutations. Even though |Ns| > 50, fixation probabilities are close to N–1 at low outcrossing rates (N = 16,000).
