here is a directly link to the genetics page because some of the genetic links on the that site seem to be down: http://www.ballpythons.ca/genetics.html ....just click on recessive, co-dominant, and dominant. That page offers a great visual.

I would also suggest reading to get a more detailed description of how the genetics work:

NERD's Genetic Info
http://www.newenglandreptile.com/genetics_intro.html
http://www.newenglandreptile.com/gen...recessive.html
http://www.newenglandreptile.com/gen...recessive.html
http://www.newenglandreptile.com/genetics_codom.html

RDR's Genetic Info
http://www.ralphdavisreptiles.com/matrix/squares.asp