Relationship between evolution speed and isogenic phenotypic fluctuations. Following the Method, we computed the mean expression level over 200 runs for each gene i. The ordinate shows the change of its average over all (= 200) individuals between the generations 80 and 90, representing the evolution speed of each gene expression i. The abscissa showed V
(i), the variance of X(i) over 200 runs for the identical genotype (J
). Computed as the variance at generation 80. The evolution progressed at around these generations and was completed before 200 generations. The noise level was σ = 0.08. See Method for details.