Death of the fittest

Fitness over time of all individuals in a population of size 100. The blue line is average population fitness. The red line is the lineage that leads to the most fit individual after 100,000 updates.

Made in Matlab. Mutation rate of 0.01. Effect of mutations is drawn at random from a uniform distribution of selection coefficients between -0.05 and 0.05. One individual reproduces per computational update (Moran process), and chance of reproducing is proportional to fitness.