Ok -- here's what the ever amazing Genetics Wizard tells me
I don't know anything about snakes, but I think the same principles apply...
25% Without Trait (ie, there's your normals)
50% Het. albino (these guys would look normal, but be het for albino)
25% Homozygous albino (there's the albinos)
So if you got a normal, you have a 50% chance of having a het for albino, and a 25% chance of just having a normal that's not het for anything.