Figure 1

Two-peak fitness landscape with one narrow peak of high fitness (peak 0), and one broader peak of lower fitness (peak 1). Each step on the x axis represents a single base mutation. Diagram adapted from Wilke4.

Two-peak fitness landscape with one narrow peak of high fitness (peak 0), and one broader peak of lower fitness (peak 1). Each step on the x axis represents a single base mutation. Diagram adapted from Wilke4.