Question

If mother's blood group is A and father's blood group is B, child's blood group could be

• A. A, B, AB
• B. A, B
• C. A, B, AB, O
• D. A, AB

Answer 1

Answer: (C)

ABO blood group is controlled by gene I and its types are IA, IB and IO.
As mother is A and the father is B, the possible genotypes for parents are - Mother - $I^A{I}^A/I^A{I}^O$ and Father - $I^B{I}^B/I^B{I}^O$ .
Therefore, the child's blood group genotype possibilities are -
$I^A{I}^A/I^A{I}^O-A$
$I^B{I}^O/I^B{I}^O-B$
$I^o{I}^O-O$
$I^A{I}^B-AB$