What I was calling a gene is actually called a Codon, there are only 64 codon's and 27,000 genes in the human body. That was my point, and while some traits are simple recessive many are actually polygenic. Coloration, eye color are just a few examples. However considering Kahl and Sharp are non compatable suggests to me that there may be more than a simple recessive trait in play.

HTH

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