>In a codominant trait, neither the mutant allele nor the normal allele completely express themselves; they kind of blend together.

This is the only part of the preceeding post that needs to be clarified a little, in my opinion.

Both the codominant mutant gene and the normal gene completely express themselves in the cell, on the molecular level. Neither the genes nor their molecular products blend together. It is the effect of both molecular products, with each one doing its own thing in the cell's biochemical machinery, that produces the blending effect that appears in the whole animal. An analogy might be a soprano singing the tune and a baritone singing harmony in a duet. As opposed to two sopranos singing the tune part or two baritones singing the harmony part.

Paul Hollander

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