Aspergillus niger fitness graph
Aspergillus niger fitness graph: Fitness as a function of genotype with edges between genotype neighbors.
The data is displayed such that an arbitrary genotype is on the left at zero mutation (call it the wild-type), and every other genotype is displayed a distance away on the x-axis equal to the number of mutations away from the wild-type. Lines between genotypes indicate that the two genotypes differ by only one mutation. Peaks are genotypes whose neighbors (genotypes one mutation away) all have lower fitness, and are displayed in red.
Data from Jasper Franke, Alexander Klözer, J. Arjan G. M. de Visser, Joachim Krug (2011). Evolutionary accessibility of mutational pathways PLoS Computational Biology 7 (8) e1002134 (2011) arXiv: 1103.2479v2