Seriously, just keep reading the same stuff again and again, and pick up a little more each time. It's a lot to learn all at once, somewhat like another language. It helps to learn some basic terminology first, like allele, incomplete dominance, etc. OOOHHH!! I just thought of a question! Is there anything known to be codominant? Anyone reading this thread? Don't mean to add more confusion, OP. Codominance is when two different alleles are expressed independantly. Like, if red and yellow were codominant, and both present, you would have a bird with both red and yellow feathers, as opposed to incomplete dominance, which would give you an orange bird. Anything codominant in chickens?