Yale University
Yale New Haven Teachers Institute: Heredity: Your Connection to the Past
An indepth introduction to genetics as a whole with sample lessons, vocabulary, and bibliography. From the Yale-New Haven Teachers Institute.
Washington State University
Washington State University: Learning Mendelian Genetics
A decent lab activity which could be used to introduce the concept of dominance and autosomal dominance. This site provides a coin toss activity to learn about Mendelian Genetics.
Other
Polycystic Kidney Disease: Autosomal Dominant Pkd
A good example of an autosomal dominant disorder occurring in polycystic kidney disease. Also supplies a little background definition to the process.