Ok, refresher on what the terms mean:
Dominant: Heterozygous and Homozygous animals look/are morphologically identical.
Co-Dominant: Heterozygous animals do not look normal. Homozygous animals look different from Heterozygous animals.
What exactly do you think happens to the super-spiders? Genetics dictates that some animals will carry both genes. So where are they? If we don't have them, then they MUST be dead. This is logic. "They don't exist" is not genetically possible. They don't mysteriously vanish before eggs are laid, that isn't the way things happen inside a snake.
Why are Spiders therefore co-dominant? Because the super form is not the same as the heterozygous form. If it were, then we would have super-spiders that look just like spiders. But we don't. So, the super-spiders express differently--they don't hatch. What they look like is irrelevent, we know they ARE different.
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