This problem refers to the MN and ABO loci. It also refers to the Rh locus, whic

Question

This problem refers to the MN and ABO loci. 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 N, AB+ based on the phenotypes at these three loci.

Select one or more:

a. None of These

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

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

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

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

Explanation / Answer

The answer is a. None of These

Because

b. Mother Type MN, B+ and Father Type N, O+ - Here there is no chance of AB+ group

c. Mother Type MN, AB- and Father Type M, O - Here there is no chance of N and AB+ group

d. Mother Type M, A+ and Father Type N, B- - Here there is no chance of N group

e. Mother Type MN, O+ and Father Type MN, A- - Here there is no chance of AB+ group

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