Q. If the blood group of one parent is AB & that of the other O, the possible blood group of their child would be
✅ Correct Answer: (B)
A or B
Explanation:
Blood groups are inherited according to the ABO blood group system, which involves two alleles: A, B, and O.
- Parent 1 (AB) has both A and B alleles.
- Parent 2 (O) has two O alleles (OO).
The possible combinations for the child are:
- A from Parent 1 and O from Parent 2 → A
- B from Parent 1 and O from Parent 2 → B
Thus, the child can have either A or B blood type, but not AB or O.
Why other options are incorrect:
- (A) A or AB or O – AB is not possible with a parent having blood group O.
- (C) A or B or AB or O – AB is not possible with one O parent.
- (D) A or B or O – O is not possible because the O parent can only pass on an O allele, and the other parent provides either A or B.
Explanation by: Mr. Dubey
Blood groups are inherited according to the ABO blood group system, which involves two alleles: A, B, and O.
- Parent 1 (AB) has both A and B alleles.
- Parent 2 (O) has two O alleles (OO).
The possible combinations for the child are:
- A from Parent 1 and O from Parent 2 → A
- B from Parent 1 and O from Parent 2 → B
Thus, the child can have either A or B blood type, but not AB or O.
Why other options are incorrect:
- (A) A or AB or O – AB is not possible with a parent having blood group O.
- (C) A or B or AB or O – AB is not possible with one O parent.
- (D) A or B or O – O is not possible because the O parent can only pass on an O allele, and the other parent provides either A or B.