Quote Originally Posted by littleindiangirl View Post
If each animal receives one copy of a gene from the parents, using the heterozygous spider as an example, what guarantees that this "dominant" gene is the one that gets passed along to the offspring and not the normal gene?
Fair enough.I'm going to Play devils advocate here for a sec. So help me out here Pastel's are Hets also only needing one copy of the gene to be expressed. The homozygous form of the mutation is a super pastel correct or a visual difference between the two. Now you breed any two animals together say pastel for example you get a 1:4 shot at producing a homozygous pastel. Now lets look for a moment at spiders you breed two spiders together and does each parent still pass half of its genetic material on to the offspring? If so then 1:4 animals will be Homozygous. Now where is it written that the Homozygous form of a mutation must look different that the Het. If the mutation only effect the scales to a certain extent or the super is so subtle we can't tell the difference from the Het form how would you know.

Just fun to think that just because some body said so doesn't mean that other possibility's don't exist