Quote:
Originally Posted by reptileexperts
From a genetic stand point - any gene that produces a visual result with only ONE copy of the gene present, that gene is said to be dominant. Now, whether or not we go into incomplete dominance vs co-dominant vs simple dominance is a whole different factor. It has been argued that Pied in ball pythons should be considered a co-dominant because you can visually distinguish het pied from normals due to markers. These markers are a visual representation of that gene meaning that it has expression. Recessive genes CAN NOT have expression with just a single copy - Anthrax is not recessive. Granite Back is Shatter and IS Co-Dom based on this theory alone. Titanium is another one that could be considered co-dom, because Citron (het tit) is distinguishable from a normal by itself. Again, a true recessive is something like Albino which does not produce any visual results with one copy of the gene. Make sense?
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From talking to on another forum there is no TRUE co-dom in ball pythons. Pieds don't count because there are a lot of hets without markers. It have to be consistent.
I can't comment on the granite/shatter because I don't know them thoroughly enough. Co-dom is the expression of two genes at once. I get the pied reference but too bad for the people who believe it because it's wrong.
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