Genotype fitness as a function of the block length.

<p>The fitness of the genotype is plotted against the proportion of the chromosome occupied by the foreign genes: corresponds to additive fitness (no epistasis), while and represent the positive and the negative epistasis, correspondingly. The points indicate the fitness of the initial block carrying 4 genes at . Point 1: <i>n</i> = 10, fitness is calculated according to eq. 12. Point 2: <i>n</i> = 10, fitness is rescaled by the length of the initial block. Point 3: initial block carries the maximum number of genes, .