Well, the reason I think it is more likely that homozygous spiders exist than that homozygous spider is lethal is because I've heard credible rumors of the first, and nothing but speculation of the 2nd. There is a member on this forum who claims to own a spider that has only been bred a fairly limited number of times, but so far has produced 100% spider offspring. I have absolutely no reason to doubt that claim. I've also heard 2nd or 3rd hand of some others who have been bred quite a bit more and still throw 100% spiders. Now, I realize this proves nothing, which is why I said I believe this possibility over the other one, rather than saying this is a fact.
It would be an easy enough thing to get pretty convincing proof if either one big breeder or a group of smaller breeders would pair known het spider to known het spider (or spider combos would work as well of course), and document the offspring ratios. 3/4 spider means it is non-lethal dominant with no visible homozygous form, 2/3 spider means it is co-dominant with a lethal homozygous form.









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