Sorry, I did screw up. Due to the 25% normals being picked out from a het spider X het spider the remaining ones would be 33% chance homozygous spider and not 25%. Can't forget about those normals!



Of course all of that assumes that there can be a homozygous spider.



Just playing the devils advocate here but I wouldn't assume it's completely dominant just because they haven't seen a visible super spider yet. Sure it's possible the homozygous spider has been produced and looks just like the heterozygous spider but until one is bred to a bunch of normals and produces only spiders it isn't proven. These things take time and I don’t suppose there has been enough time for this new morph for anyone to know for sure yet.



The other two possibilities I see are:



1. No one has been lucky enough to produce a homozygous spider yet. I'm not sure how many spider X spider crosses have been done yet and how many babies where produced but maybe the dice just haven't rolled right yet.



2. It's possible (although I don't think likely and I certainly hope not the case) that it could be co-dominant and lethal when homozygous so homozygous spiders never hatch. Again, I don't think this is likely but it's always a possibility with "dominant/co-dominant" mutations and people don't seem to think of it. Just like the possibility that two recessive mutations are close together on the same chromosome making them difficult to combine it's an unlikely but possible thing that is one of several possibilities to consider.

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