Question

What is a co-dominant allele?

Answer 1

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Codominance occurs when multiple alleles are expressed at the same time.

An example of codominance is blood type. The glycoprotein antigens that make blood types A and B can both be expressed without one "overpowering" the other. In other words, there is no recessive allele here. We call this blood type AB--both the A allele and B allele are expressed.

Contrast this without incomplete dominance. Here, rather than both traits being expressed in full, the traits blend. A flower heterozygous for color with one red allele and one white allele will be pink, rather than white or red, if incomplete dominance is occurring.

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Answer 2

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In complete dominance, only one allele in the genotype is seen in the phenotype. In codominance, both alleles in the genotype are seen in the phenotype. In incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype.