Other
Evolution: The Theory of Natural Selection (Part 1)
These pages are part of a site called Evolution that accompany a textbook by the same name. Mark Ridley is the author. This section has an advanced discussion of determining allele and genotype frequencies using the Hardy-Weinberg ratio.
PBS
Pbs: How Does Evolution Work?: Breeding Bunnies
This resource provides directions for a lab in which students observe changes in a gene pool of bunnies affected by natural selection. Includes PDF resources.