Quote Originally Posted by veedubz View Post
spider isnt a dominant trait it is co-dominant as it only reproduces its self in half the clutch. if it were dominant then the entire clutch would be spiders.
It's referred to as dominant because there is no known super version, and so it is assumed that SS and Ss are visually identical, whereas co-dominant genes (PP and Pp) are visually distinct.

The dominant or recessive nature of a particular gene has no bearing on the outcome of the clutch (in terms of percentages of genetic carriers), as that is based entirely on which allele is passed from each parent.