Figure 2.—

Consecutive mutator fixation. The curves show the lowest mutation rate that is present in the population at a given time; this is the rate that has been fixed. All curves: N = 500, = 0.1, t_let = 0.1, t_mut = 0.01; the black curve has initial U₀ = 5 × 10⁻⁵ and f = 10; red curves show seven replicate runs with initial U₀ = 0.0025 and f = 2.0; blue curves show seven replicate runs with initial U₀ = 0.0025 and f = 1.5; replicate runs are shown with a slight offset.