This problem refers to the MN and ABO loci mentioned in class. It also refers to

Question

This problem refers to the MN and ABO loci mentioned in class. It also refers to the Rh locus, which is responsible for the positive/negative part of the blood type. The Rh+ allele is dominant to the Rh- allele at this locus. Select all couples who could be the parents of a child with phenotype M, B- based on the phenotypes at these three loci. If none of these couples could be the parents of this child, select "None of These". Select one or more:

Mother Type M, A+ and Father Type N, B-

Mother Type MN, AB- and Father Type M, O-

Mother Type MN, B+ and Father Type N, O+

Mother Type MN, O+ and Father Type MN, A-

None of These. I think it could be answer choice b BUT I im not sure.

Explanation / Answer

Yes, answer is choice B. ( Mother Type MN, AB- and Fatehr Type M, O-)

Since Rh+ allele is dominent over the Rh- allele, it is not possible that the B- child is produced from any Rh+ allele containing parents.

All other options are having parents with Rh+ allele so, the right answer is B.

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