I see what your saying but also the mistake. The Allele is the actual gene pair in a loci, they do not have to be matching genes to be an allele though in most cases are. Co-doms such as Pastels have non matching genes in their allele (ie if normal is AA and Super Pastel is PP then the allele for Pastel is AP.) Incombatible genes come up when both genes share a Loci but are both recessive. (ie two forms of Amel aa we'll call type one and bb is type b. When bred you would have a allele of ab both genes are recessive to normal and to each other so you end up with a normal).Originally Posted by jhall1468