As a reptile breeder i have never seen or even heard of this specific type of genetic mutation. the closest thing i can come up with is albino paradox. In the snake world for an example reccessive traits like if you breed albinos together you get albinos and normals but %100 heterozygous albino. But paradox is just a random gene that pops up and cant be duplicated but theres a high chance of all the siblings of the albino paradox to carry the paradox gene. It will just randomly appear out of no where from one random breeding.