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?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → O
The possible blood group combinations for the children of a man with blood group A and a woman with blood group AB.
- A man with blood group A can have two possible genotypes: AA or AO.
- A woman with blood group AB has the genotype AB.
We can consider the combinations using these genotypes:
- If the man's genotype is AA:
- Possible offspring genotypes: AA, AB
- If the man's genotype is AO:
- Possible offspring genotypes: AA, AB, AO, BO
From these combinations, the possible blood groups in their children can be:
- A (from AA or AO)
- B (from BO)
- AB (from AB)
The blood group O (which has the genotype OO) will never appear because neither parent can provide two O alleles.
Therefore, blood group O will never be found in their children.