ReNEET 2026 · Biology · Q169Principles of Inheritance and VariationIn our bank: Strong match · 85%
For a person with blood group 'O', which of the following is not a possible combination of parents' blood-group genotypes?
- A.Father: I^A i and Mother: I^B i
- B.Father: I^A i and Mother: I^A i
- C.Father: I^B i and Mother: I^B i
- D.Father: I^A I^B and Mother: I^A i✓
Correct Answer
(D) Father: I^A I^B and Mother: I^A i
Solution & Explanation
A child of blood group O has genotype ii, so each parent must carry a recessive i allele to pass on. In option (4) the father is I^A I^B — he has no i allele to contribute, so an ii child is impossible. The other crosses can each produce an ii offspring.
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