PBS
Pbs Learning Media: Mendel's Laws of Genetic Inheritance
This interactive activity, adapted from the Dolan DNA Learning Center, uses Punnett squares to illustrate Mendel's laws of inheritance and how a particular gene combination results in a 3-to-1 ratio of dominant-to-recessive traits.
Concord Consortium
Biologica: Web Lab, Mendel's Peas
At this site see an online visual of meiosis, fertilization, and inheritance and play a game.