The best herper genetics web sites are more or less incomplete. The worst ones are loaded with incorrect information.
If you want to learn the principles of genetics, spend a few bucks to buy Charles Pritzel's Genetics for Herpers. Or Schaum's Introduction to Genetics, by Elrod and Stansfield.
Kevin Mccurley's "The Complete Ball Python" is great too. It can be had for about 40-50 bucks. Amazon may have some used for cheaper.