Ncert Exercises & Solutions

Q. 2. Can a child have blood group 'O' if his parents have blood group 'A' and 'B' Explain?

A child have blood group O in the following two cases
Case I when father is $I^{A} i and mother is I^{B} i .$

The offsprings will have the above possible blood groups. i.e., AB, A, B and O
Case II when father is $I^{B} i and mother is I^{A} i .$

The offspring will have the above possible blood groups, i.e., AB, A, B and O. Thus, a child can have blood group 'O' if parents have heterozygous alleles for group 'A' and 'B'.

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