I followed the thread below, but thought it prudent to post my reply up here. The combination of two homozygous recessive traits in a single individual is just that: the combination of two (or however many the case may be) in a single individual. It is a phenomenon much different than co-dominance or incomplete dominance, since the expression of one trait does not have an effect on the expression of the other. For example, the homozygous expression of amelanism (we'll call it aa - the designation is really arbitrary) does not have an effect on the homozygous expression of axanthism (we'll call it xx). And animal displaying both traits would be aa AND xx, with the result being a "snow".

Here's a link to Vinny Lynch's website, where he has a pretty killer explanation of squamate genetics... and rightly so, since he's a geneticist... Anyway, it explains simple recessive traits, co-dominance, incomplete dominance, and multigenic traits in fairly plain language.

Natural Selection Reptiles

-Cole

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