you have to have a morph to start with... You can't breed a bunch of different locale normals to get an animal that looks like you want and call it a new genetic mutation.
well that is exactly what they did with pastel boa constrictors, reduced pattern in ball pythons, and reverse okeetee in corns to name a few. i'm not trying to be a smart a.. but i mean that is exactly what a selective breeding trait is, it has nothing to do with co dom, recessive, i believe the correct scientific term for it is polygenetic, and it has happened on more than one basis, all you are doing is selecting one or two traits that you think look good in a group of animals, then breeding to strengthen that trait till it starts showing in most all of the babies of a litter or clutch, then once you reach the point where you have the look the way it is designed to be, you can call it whatever and bam, you have a polygenetic trait on your hands.