Hi,
To get a 100% het you breed the visual morph ( which is homozygous ) to anything else except another homozygous example of the same morph.
If you breed two 100% hets then 25% of the offspring should be the visual homozygous ( ie an albino or an axanthic ) and 50% will be het for the trait and the remaining 25% won't have any of the genes for that morph at all.
But the hets and the normal will all look just like normal ball pythons and you won't be able to tell which is which so we say that all of those are 66% het because two thirds of them will be het and one third won't.
Only the snakes that get two copies of the axanthic gene will be visually axanthic ( homozygous in other words ) and all the rest will look normal.
dr del
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