University of Arizona
University of Arizona: Co Dominant Problem
This site, which is provided for by the University of Arizona, gives an interactive genetics problem dealing with co-dominance. Links are provided throughout this site for additional information on related subjects.
University of Arizona
University of Arizona: Monohybrid Problem Set
This site, which is provided for by the University of Arizona, gives an interactive problem on blood type, which is an example of codominance. Links are provided to access the various subjects covered in this problem set.
Other
University of Newfoundland/codominance
A simple slide show from a lecture on genetics showing how blood typing shows codominance.