Palomar Community College District
Palomar College: Practice Quiz for Mendelian Genetics
This site from Palomar College provides an online practice quiz includes history as well as some of the genetics. Includes feedback. A great learning and practice site.
University of Arizona
University of Arizona: Dihybrid Problem Set
This site is provided by the University of Arizona and it gives great information on the subject. Good collection of dihybrid crosses which exemplify the issue of independent assortment. Work these once you think you've mastered th concept.