The fact that type AB blood appears to be the result of a compromise between genes for type A and type B blood provides a good example of

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Type AB blood is an example of codominance, where both alleles are expressed equally and result in a phenotype that shows characteristics of both alleles. In the case of type AB blood, the A and B alleles are both expressed, resulting in a phenotype that has both A and B antigens on the red blood cells.

The Fact That Type AB Blood Appears to Be the Result