Assertion : A gamete may carry either of the traits but not both.
Reason : This is Mendel's second law or law of independent assortment.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

To solve the question, we will analyze the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "A gamete may carry either of the traits but not both."
- This is true because gametes are haploid cells, meaning they contain only one set of chromosomes. Therefore, they can carry only one allele for each gene.

2. **Understanding the Reason**:
- The reason provided is "This is Mendel's second law or law of independent assortment."
- Mendel's second law states that alleles for different traits are sorted independently of one another during gamete formation. This means that the inheritance of one trait does not affect the inheritance of another trait.

3. **Connecting Assertion and Reason**:
- While the assertion is true (gametes carry only one allele), the reason given (Mendel's second law) is not the direct cause of the assertion. The reason is about the independent assortment of alleles for different traits, not about why a gamete carries only one allele.

4. **Conclusion**:
- The assertion is true, but the reason is false. Therefore, the correct answer is that the assertion is true and the reason is false.

### Final Answer:
- The assertion is true, and the reason is false.