Question: What is Codominance?

Emma Bennett answered on 19 Jun 2011:

Co-dominance is when the viable appearance of a characteristic (phenotype) is brought about by the expression of both alleles and one is not dominant or recessive to the other.

For example people with the blood type AB express the A and B alleles co-dominantly, where as people with the blood type A could contain the alleles for both A and O but because the O allele is recessive then they will be blood type A.

Another example is that when crossing a plant with red flowers and a plant with white flowers scientists found that the resulting plants (their children) had pink flowers because the red and white alleles were co-dominant and therefore both expressed which produced the colour pink.