There have been cases of spiders throwing nothing but spider in all the clutches. But it's difficult to say if it's really good odds, or if it's really a homozygous spider. I don't know of anyone who has kept really good records over a period of several seasons to "prove" their spider is a homozygous.
I was on the way to do so with Sam, but unfortunately he died. He did throw several clutches of all spiders, never producing a single normal. But I did have a lot of failed eggs. Anytime there was a embryo developed enough to show pattern, it also showed the spider pattern. So not only all hatched babies had come out spiders, but all formed fetuses were spiders. Again... I don't feel he had produced ENOUGH clutches to really prove it, and since he died, it's a moot point.
I think there are rare cases of homozygous spiders out there, but it doesn't seem to be a easily produced animal(i.e. just breed spider x spider and you get homozygous spider). It must be a simple glitch in the genetics that occurs once in a very great while. I also think that there is a flaw in the genetics of a homozygous spider since I had so many failed eggs out of Sam.
All of the above are only my opinions and theories, not proven, not presented as fact, and to be taken only as discussion of theory.
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