If a black (or dark brown) and pure white were bred to a very yellow coastal, and they naturally made intermediate shaded offspring, it would be very normal (and expected) since yellow is more of a dominant color in them over white. Now if you bred any of the intermediate offspring back to the very yellow parent and 50% of the offspring were pure white, it would prove the pure black and white individual was indeed a recessive gene axanthic even though you couldn't tell by it's outward visual phenotype. It would be similar to producing hypo Hondos from pairing a known hybino x amel het hypo.


~Doug
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"a snake in the grass is a GOOD thing"

serpentinespecialties.webs.com

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