Incubation temps and genes

To all the bigger breeders that have done experiments with incubation temps. Is there and proof that incubation temps can affect sex or genes? Like in geickos? For example...low temps produce more normals than morphs in a codom pairing? Or high temps produce more females than males? I am asking because I did a lot of codom to normal pairings and I'm getting A LOT of normals hatchings...odds just not balancing out for me. What's your thoughts?

For ball pythons temps are 85-90 I'm pretty sure temp has anything to do with the sex of the babys, or the morph say you put a pastel with a spider trying to go to a bumble bee its a one in four chance of getting a bumble bee doesnt mean your always going to get that one in four chance.

My guess is that temps will affect male to female ratios, like in many other species of eggs.