Assertion :- Mutation result in changes in the genotype and the phenotype of an organism.
Reason :- Mutation is a phenomenon, which result in alternation of DNA sequences.

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 "Mutation results in changes in the genotype and the phenotype of an organism."
- This means that mutations can alter the genetic makeup (genotype) and the observable traits (phenotype) of an organism.

2. **Understanding the Reason**:
- The reason provided is that "Mutation is a phenomenon which results in alternation of DNA sequences."
- This indicates that mutations involve changes in the DNA sequences, which can lead to changes in the proteins produced and, consequently, the traits of the organism.

3. **Analyzing the Relationship**:
- To determine if the reason supports the assertion, we need to recognize that changes in DNA sequences (mutations) can lead to changes in the proteins that are produced.
- These changes in proteins can affect the organism's traits (phenotype) and genetic makeup (genotype).

4. **Conclusion**:
- Both the assertion and the reason are true.
- The reason correctly explains why the assertion is true, as mutations in DNA sequences can indeed lead to changes in both genotype and phenotype.

5. **Final Answer**:
- Both the assertion and reason are true, and the reason is the correct explanation of the assertion.