Assertion : In a person with AB blood group, the erthrocyes carry both A and B antigenes on their surface.
Reason : The allels `I^(A) and I^(B)`, that produe AB blood group, are codominant and both are expressed.

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. If both Assertion & Reason are trur but Reason is not a correct explanation of the Assertion.
C. If Assertion is True but the Reason is Flase.
D. If both Assertion & Reason are false.

Answer

**Step-by-Step Solution:**

1. **Understanding the Assertion:**
- The assertion states that in a person with AB blood group, the erythrocytes (red blood cells) carry both A and B antigens on their surface.
- This is a true statement. Individuals with AB blood type indeed have both A and B antigens present on their red blood cells.

2. **Understanding the Reason:**
- The reason provided states that the alleles \(I^A\) and \(I^B\), which produce the AB blood group, are codominant and both are expressed.
- This is also a true statement. In genetics, codominance means that both alleles in a heterozygous individual contribute to the phenotype. In the case of AB blood group, both \(I^A\) and \(I^B\) are expressed, resulting in the presence of both A and B antigens.

3. **Evaluating the Relationship Between Assertion and Reason:**
- Since both the assertion and the reason are true, we need to determine if the reason correctly explains the assertion.
- The presence of both A and B antigens (assertion) is indeed due to the codominance of the alleles \(I^A\) and \(I^B\) (reason). Therefore, the reason does provide a correct explanation for the assertion.

4. **Conclusion:**
- Both the assertion and the reason are true, and the reason correctly explains the assertion.

**Final Answer:**
- Both Assertion and Reason are true, and the Reason is the correct explanation of the Assertion.

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