something that's het amel would give you 1:2 amels. Something that's a combi, like a ghost het snow would give you some portion of multi-hets too... Of course you snake might have hets you don't know about which would give you more variety in F1.
Hope this help! Check out the Progeny Predictor program... it's a tad out of date, but still useful.
^Currtis