Im still confused

[PythonWallace]

Co-doms have visable heterozygous markings. Doms just have the homozygous markings. Well, thats they way I like to think of it

Dominant mutations actually show the visual trait as a heterozygous animal, just like co-dominant animals do. The difference is in the homozygous appearance of the animal. All first generation mutations that throw visual offspring are first labeled as proven dominant. It takes another generation of breeding to see if dom x dom has a new, visable trait in the homozygous form. If it does, it's now proven to be a co-dominant trait. If it doesn't throw supers in a homozygous animal it's still only a dominant trait.