Evolution

Sexual Selection in Guppies  simulates Endler's 1980 classic experiment on the balance of sexual selection and natural selection.  In guppies, females prefer to mate with males that have lots of spots, but those males are more easily seen by predators.  You can manipulate strength of female preference and the number of predators. 

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Industrial Melanism  This model simulates the classic example of natural selection on color patterns in peppered moths (Biston betularia). When air pollution is low, lichens cover the trees and the light moths are well camouflaged.  When air pollution is high, the trees become dark, and the light moths stand out. The simulation just prior to the industrial revolution and proceeds through to modern day.
Random Effects    This model illustrates random genetic drift, bottleneck effects, and founder effects.  Three incompletely dominant alleles exist the the simulated population (red, yellow, and blue), with heterozygous individuals appearing as the blending of the two alleles.  You can adjust the mainland population size, and put it through a bottleneck.  Also, you can colonize two islands off of the coast of the mainland with a random subset of the mainland population.