Oh and as for homozygous spider being lethal. Absence of evidence is not evidence except when evidence would be expected. Basically that means that since basic genetics tells us we should see pairings of spider to spider produce 25% homozygous, we would have many of these animals in the population and thus should see a homozygous spider prove out. Since we don't see that we have to ask the question of where those animals are. Its pretty common to have a lethal gene so this theory is not without precedent. It won't be proven conclusively without a proper scientific test. Ideally this would include genetic testing. So not seeing a homozygous spider is evidence for the lethal theory but its far from conclusive. Not seeing a homoyzgous spider could also be evidence for aliens teleporting them out of the mother before the eggs are layed. Again the reason we are conjecturing its lethal is because we have proof of this phenomena in other species.
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