Question

The father has blood group AB and mother 'O'. The child is supposed to have which of the following blood groups?

• A. A or B
• B. A only
• C. B or O
• D. B only

Answer 1

The correct option is A A or B

The genotype of the father with blood group AB will be I${}^A$I${}^B$. Therefore the gametes will be I${}^A$ and I${}^B$. The genotype of the mother with blood group O will be I${}^O$I${}^O$. The gamete will be I${}^O$. These gametes on crossing can give two possibilities I${}^A$I${}^O$ or I${}^B$I${}^O$. Thus the genotype of the child will be I${}^A$I${}^O$ or I${}^B$I${}^O$. Thus the child can have either blood group A or B.

Thus the correct answer is option A.