PBS
Pbs: Our Genes/our Choices: The Probabilities of Problems: A Look at Inheritance
Learn how the genes inherited from two parents can be recombined in their offspring in this simulation activity. In addition, investigate the probabilities of passing on inherited genetic disorders.
University of Arizona
University of Arizona: Blood Types Tutorial
This site from the University of Arizona describes how blood type is passed on from parent to child. The tutorial covers the genetics of the ABO blood groups as well as Rh factor. There are even practice problems and blood type calculators!