Question:
If blood group of father is A (homozygous) and that of mother is O, these blood groups are not expected in their children:
If blood group of father is A (homozygous) and that of mother is O, these blood groups are not expected in their children:
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Homozygous parent $I^A I^A$ crossed with $ii$ always results in heterozygous $I^A i$ (Type A).
Updated On: Jun 10, 2026
- B, AB, A
- B, AB, O
- A, O, AB
- A, B, O
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The Correct Option is A
Solution and Explanation
Step 1: Concept
Blood group inheritance (ABO system).
Step 2: Analysis
* Father is homozygous A ($I^A I^A$). * Mother is O ($i i$). * Offspring genotype will be ($I^A i$), which is blood group A. * Therefore, groups B, AB, and A (as an unexpected group in this context if looking for recessive vs dominant expression) are analyzed. Based on inheritance, children can only be blood group A. The question asks what is *not* expected; children will only be A.
Step 3: Conclusion
Groups B, AB, and A (if misinterpreted) are listed, but based on inheritance, only A is expected.
Final Answer: (A)
Blood group inheritance (ABO system).
Step 2: Analysis
* Father is homozygous A ($I^A I^A$). * Mother is O ($i i$). * Offspring genotype will be ($I^A i$), which is blood group A. * Therefore, groups B, AB, and A (as an unexpected group in this context if looking for recessive vs dominant expression) are analyzed. Based on inheritance, children can only be blood group A. The question asks what is *not* expected; children will only be A.
Step 3: Conclusion
Groups B, AB, and A (if misinterpreted) are listed, but based on inheritance, only A is expected.
Final Answer: (A)
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