Good poll. It shows how little interest there is in breeding spider X spider even though so many of us could now afford to do so. Unfortunately we may never know how many possible homozygous spiders where made early on. I know TSK tried at least one year more recently.
Just to clear up, "dominant" mutations like pinstripe have homozygous animals. What defines pinstripe as dominant is that the homozygous pinstripe is the same mutation as the heterozygous one. Both have the pinstripe phenotype. The way the homozygous pinstripe was proven was by producing a large number of only pinstripe offspring. But just because the mutation is classified as dominant when the heterozygous version of a pinstripe is bred to a non pinstripe the eggs still have 50/50 chance of getting the pinstripe mutation. It’s only the homozygous animals that produce 100% of the same offspring.
If the spider mutation is lethal when homozygous I believe that would technically be a co-dominant mutation because there is a difference between the phenotype of the hets (spiders) and the homozygous (dead).
Unless there is a proven homozygous spider we don't know about and it looks and acts like the normal heterozygous spiders then claims that spider is a dominant mutations where just a guess spread as rumor. I might have been the first to publicly guess that spider might be homozygous lethal around 2003 or so but I've always stated that it's just a possibility and not proven (or actually provably).Originally Posted by jason79
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