Question:
Which is the correct genotype of blood group A?
Which is the correct genotype of blood group A?
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Blood group A = I\textsuperscript{A}I\textsuperscript{A} or I\textsuperscript{A}i.
Updated On: Jun 19, 2026
- I\textsuperscript{A} I\textsuperscript{B}
- I\textsuperscript{O} I\textsuperscript{O}
- I\textsuperscript{B} I\textsuperscript{B}
- I\textsuperscript{A} I\textsuperscript{O}
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The Correct Option is D
Solution and Explanation
Step 1: Understand ABO system.
Blood group in humans is controlled by multiple alleles: I\textsuperscript{A}, I\textsuperscript{B}, and i (I\textsuperscript{O}).
Step 2: Phenotype A characteristics.
Blood group A expresses antigen A on RBC surface.
Step 3: Possible genotypes.
Group A can be either I\textsuperscript{A}I\textsuperscript{A} or I\textsuperscript{A}I\textsuperscript{O}.
Step 4: Evaluate options.
Only option (4) matches correct genotype I\textsuperscript{A}I\textsuperscript{O}.
Step 5: Genetic reasoning.
I\textsuperscript{A} is dominant over i, so heterozygous genotype also expresses A blood group.
Step 6: Conclusion.
Thus correct answer is I\textsuperscript{A}I\textsuperscript{O}.
Blood group in humans is controlled by multiple alleles: I\textsuperscript{A}, I\textsuperscript{B}, and i (I\textsuperscript{O}).
Step 2: Phenotype A characteristics.
Blood group A expresses antigen A on RBC surface.
Step 3: Possible genotypes.
Group A can be either I\textsuperscript{A}I\textsuperscript{A} or I\textsuperscript{A}I\textsuperscript{O}.
Step 4: Evaluate options.
Only option (4) matches correct genotype I\textsuperscript{A}I\textsuperscript{O}.
Step 5: Genetic reasoning.
I\textsuperscript{A} is dominant over i, so heterozygous genotype also expresses A blood group.
Step 6: Conclusion.
Thus correct answer is I\textsuperscript{A}I\textsuperscript{O}.
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