Just something i found on another site you might find interesting
http://www.newenglandreptile.com/genetics_intro.html
http://www.newenglandreptile.com/geneti ... ssive.html
http://www.newenglandreptile.com/geneti ... ssive.html
http://www.newenglandreptile.com/genetics_codom.html
I thought this was a little easyer to understand