There is a previous discussion on spiders and the possibility of them being dominant or co-dominant.

If spiders (and pinstripes) are recessive, then all spiders (and pins) would have to be homozygous because for the spider genotype to be expressed would require TWO "spider" genes. A snake with only one "spider" gene and one normal gene would be a normal HET for spider and would look normal. The same would happen with pins.

If we consider the spider to be recessive and call the spider gene "s", the spider would have to be "ss". A normal would be dominant for that gene, and be either "Ss" or "SS" That means that if you cross a spider (ss in this scenario) with a normal, the only way you would obtain spiders in the offspring would be if the normal was a HET spider (Ss).

If the normal had no spider genes (SS), like most normals we could assume, all the offspring would look normal (Ss, Het for spider). However, a conclusion from this is that you could get spiders from a normal x normal cross if both parents are het spiders (Ss).

This doesn't seem to be the case, I don't know of anybody producing spiders from two normals, and I don't see anybody saying that they have 100% Het Spiders or 50% Het spiders, like is the case with the proven recessive genes like Pieds for example.


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