Q39. If a man with blood group A marries a woman with
blood group AB. Which of the following blood group
will never be found in their children?
(a) A
(b) B
(c) AB
(d) 0

Question

FirstInTest · Accepted Answer

Correct answer: d. To determine the possible blood groups of the children, we need to consider the genotypes of the parents:
*   **Man with blood group A:** His genotype can be either homozygous dominant (I^A I^A) or heterozygous (I^A i).
*   **Woman with blood group AB:** Her genotype is uniquely I^A I^B.
For a child to have blood group O, its genotype must be (ii). This requires the child to inherit an 'i' allele from both parents.
However, the mother (genotype I^A I^B) does not possess an 'i' allele; she can only pass on I^A or I^B to her offspring. Since the child cannot inherit an 'i' allele from the mother, it is impossible for them to have a child with blood group O. Possible blood groups would include A, B, and AB, depending on the father's exact genotype.

Related Questionsin Biology / Genetics

Practice More CUET UG Questions