Figure 2

Histogram of the ratio of resistance allele frequency at generation 10 in the extremes cases of a fully effective ( k = 0 ) compared to an inefficient ( k = 1 ) synergist:$\mathit{y}\mathbf{=}\frac{{\mathit{p}}_{\mathbf{10}}\mathbf{|}\mathit{k}\mathbf{=}\mathbf{0}}{{\mathit{p}}_{\mathbf{10}}\mathbf{|}\mathit{k}\mathbf{=}\mathbf{1}}$). Only values of y < 2 shown, which constitute 99.3% of the number of simulations. Values higher than 1 (y > 1) indicate the counter-intuitive result, i.e., that the synergist presence drives resistance faster.