So as was already stated, axanthics are animals lacking yellow pigment. They are recessive(think blue eyes in humans, you need to get blue eyed gene from both mom and dad in order for you to have blue eyes, if you only have one, you carry the trait, but don't show it) so they need to be homozygous in order to express the axanthic look.

Het. stand for heterozygous(having only one copy of the gene) and what the 66% Het. Axanthic means that there is a chance it has the gene, but you won't know until you breed it with an axanthic or 100% het axanthic. 66% Hets come from 100% het X 100% het breedings. Statistically, you have a 1/4 odds of hatching an axanthic in this breeding, 1/2 odds of having het. axanthic, and a 1/4 shot at having a normal. Now here is where the 66% part comes in, you can't visually tell the difference between a normal and a het. so since the breakup would be 2 to 1 odds of a "normal" looks snake having the axanthic gene equates to a 66% possibility.

So your snake may have the gene, and more than likely does, but you won't be able to prove it without breeding it to a 100% het axanthic (these are produced from Axanthic X Normal breedings, which guarantees that all babies have 1 copy of axanthic gene) or a Visual Axanthic from the same line.

-Dan

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