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Thread: Genetics....

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    BPnet Veteran TessadasExotics's Avatar
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    Re: Genetics....

    Quote Originally Posted by paulh View Post
    You are correct in writing that herpers misrepresent some truths. That is why I prefer standard genetics definitions to the herper versions. You might like to look at the Genetics Home Reference -- http://ghr.nlm.nih.gov/handbook. It's free.

    The dominant/codominant/recessive classification results from a comparison. For example, both the mojave gene and the lesser gene are codominant (for this discussion a synonym of incomplete dominant) to the corresponding normal gene. However, the lesser gene is dominant to the mojave gene. Because both the super lesser and the het lesser/mojave snakes are blue-eyed white, while the super mojave is nearly a blue-eyed white but has some pigment on the top of the head and neck. The classification is different because the comparison is to different gene. I could point to several examples (not in snakes, yet) where one gene is dominant to a second gene, codominant to a third, and recessive to a fourth.

    The comparison can be either explicit or implied. "The lesser gene is dominant to the mojave gene" is an explicit comparison. "The lesser gene is a codominant mutant gene" is an implied comparison. And when the comparison is implied, the assumption is always that the comparison is with the corresponding normal gene.
    Lesser is NOT "dominant" to the Mojave gene in any way shape or form. They are actually both codominant genes. And there is no het lesser/mojave.
    Last edited by TessadasExotics; 02-05-2015 at 07:59 PM.
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