Let me add something here. If a snake has a homozygous for and does not express traits in the heterozygous form it is a simple recessive. If it expresses traits in it's heterozygous form it is a codom. Due to the fact a spider expresses traits and you are saying it is still possible to have a homozygous form then what option is left? You guys should keep all of this super spider talk for one of the thread started for it though.