However, the distribution of fitness peaks in the NK landscapes grown here under constructional selection are nowhere near the distributions for generic NK landscapes with identical genotype-phenotype maps. Constructional selection produces genotype-phenotype maps that are much more finely tuned to the fitness function under which they evolved. To illustrate this, the distribution of fitness peaks for several landscapes evolved under constructional selection are plotted in figure 8 . Each point represents the fitness peak obtained by starting an adaptive walk from a randomly sampled genotype. In each plot, the peaks attained from 1000 random starting genotypes are sorted by fitness.
Plateaus indicate large domains of attraction for the peak.
The plateaus, and discontinuities between them, indicate fewer and larger domains of attraction for the evolved landscapes, i.e. they are smoother than the generic landscapes. While the least fit peaks are approximately the same for both evolved and generic landscapes, at various points in the ranking, the fitness of the evolved landscapes grows much higher. Interestingly, the jumps in the distribution are highly variable. An additional beneficial outcome of constructional selection is that the genotypes resulting at the end of the run are usually the apparent global fitness peak.