Change in the frequencies of fixed mutation rates vs . lg( U )-given different initial individual fitness ( R
= 1). y
represents normal distribution with mean μ = 0.5 and variance σ2 = 0.1; y
represents gamma distribution with α = 20, β = 20; and y
represents the initial fitness of all individuals equal to a unified value 1.0. In all cases, the conditions were constant: N = 105, p
= 3%, , .