Spider and Pinstripe should not be considered dominate, since there is a super fom and that super fom is lethal. If it was as simple as dominate and we assume that the homozygous form looks the same, we would be able to prove out homozygous individuals by the production of 100% spider or pinstripe offspring. And by cornells defintion of co-dominate we can safely put them under this catagory by listing the co-dom as lethal homozygous. One last statement - If Spider was true dominant, it would block expression of any other gene related to pattern, but as we see with other traits being visually observed when combined with spider, we again can assume that it is co-dominate, a trait that effects the phenotype without masking other genes whos traits can also be expressed :-).

Very good post though for the majority of BP people!