This sounds along the lines of Ralph Davis' "Platty Daddy" and his so called "hidden gene" and the same with NERD's woma's. Some of them carry a hidden gene which is why NERD's woma - Lesser pastel (http://www.newenglandreptile.com/ava...&cat=46&page=1) looks so much different than any others. Could it be that this wild gene is what you are talking about, and it only appears once it's overlapped so to speak?