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Q. If the blood group of one parent is AB & that of the other O, the possible blood group of their child would be

  • (A) A or AB or O
  • (B) A or B
  • (C) A or B or AB or O
  • (D) A or B or O
  • Correct Answer - Option(B)
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Explanation by: Admin

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.

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