as i understand the genetics of a "normal" (normal meaning not carrying any other genetics) spider being co-dom you shoud get 50% spiders and 50% normals. the normals are just normals / non hets. Kirk
Wrong.. Sorry
Spiders do not yet have a super form. not proven unless it's changed recently.
A spider to a normal would give you 25% spiders
and even a spider to a spider isn't guaranteed to produce 50% spiders.