Question

A man has type A blood and his wife has type B blood. A physician types the blood of their four children and is amazed to find one of each of the four blood types. He is not familiar with genetics and calls upon you to explain how such a thing could happen. What would you say? Explain using a description of the parental allele possibilities.

Answer 1

Answer:

Explanation:

There's nothing to get amazed to find all the four types of blood groups in the progeny, provided the parental genotypes are AO and BO.

The four types of blood groups included A, B, AB and O.

Had the parental genotypes been AO and BO, the progeny would include all the four blood groups A with genotype AO, B with genotype BO, AB with genotype AB and O with genotype OO.

It happens only in this case and not in any other as the alleles A and B are co dominant to each other and completely dominant over the allele O.