. Ther rare but ive seen what they call super females and super males. Example a male that is so male is growing polen sacs all up and down on the main trunk and all over the branches at places they shouldnt be . Or females that wont reverse. Its possible when reversing males to make seed to end up with a small percentage of yy seed, these are known as super males. But they usualy are really hard to germinate naturaly or will abort. A plant like this would be impossible to reverse and get any x traits out of it.