I think the jury is still out on spider. At least no one has come forward with a homozygous spider to let us know that it looks and acts the same as the normal (heterozygous) spiders except for producing 100% spider when bred to normals. There have been rumors that such an animal might exist but with no one claiming it I have to believe it's still possible that spider is homozygous lethal which I think would be technically co-dominant. So pinstripe is the only proven dominant ball python mutation by my count.
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