Question

A child with blood group A has father with blood group B and the mother with blood group AB.

Choose the option that gives the correct genotypes of father, mother and the child:

Options

• Father - I^Ai, Mother - I^Bi, Child - I^Ai

• Father - I^AI^B, Mother - I^Ai, Child - I^AI^A

• Father - I^Bi, Mother - I^AI^B, Child - I^Ai

• Father - I^BI^B, Mother - I^AI^B, Child - I^AI^A

Answer 1

Father - I^Bi, Mother - I^AI^B, Child - I^Ai

Explanation:

The mother’s AB blood group genotype is I^AI^B. The father’s blood type is B. The father must have the I^Bi genotype in order for the child to have blood group A. The following cross will explain: