First off there two separate things. co-dominate co-dominate =super (as with pastels) there is a visual differance. Incompleat dominate Incompleat dominate = Dominate (as with spiders)but there is no visual differance. The better visual the more $$$$. Who said looks are'nt everything!



This is not correct. Incomplete dominance can be more closely related to codominance, while complete dominance shows no difference between a het and homozygous animal. If it is true that spiders show no difference, they are exhibiting COMPLETE dominance.

The difference between incomplete and codominance is a little trickier. Incomplete dominance is easier to understand, giving a blending of the two phenotypes. When genes are codominant, it's not blending exactly, but both specific phenotypes are seen in the same animal. An example is blood type. A and B are codominant to each other and dominant to O. This means that each cell produces A and B antigens, not a single blended version. Another way to think about it would be in reference to fur color. If black and white fur color of a species of animal exhibited incomplete dominance, each hair would be gray. If they were codominant, then there would be a mix of black and white hairs, giving an overall gray coloration.

I think a lot of people confuse the two, and codominant may not be the right term for a lot of morphs labeled as such...

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