Consider the following statements `:`
Assertion (A) `:` Amber codon is a termination codon .
Reason (R ) `:` If in a m-RNA, a termination codon is present, the protein synthesis stops abruptly whether the protein synthesis is complete or not.
Now select you answer from code given below `:`

Options

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

Answer

To solve the question, we need to evaluate the given Assertion (A) and Reason (R) statements:

**Assertion (A):** Amber codon is a termination codon.
**Reason (R):** If in an mRNA, a termination codon is present, the protein synthesis stops abruptly whether the protein synthesis is complete or not.

### Step-by-Step Solution:

1. **Understanding the Assertion (A):**
- The amber codon is represented by the sequence UAG in mRNA.
- It is classified as a termination codon (or stop codon) because it signals the end of protein synthesis.
- Therefore, Assertion (A) is **True**.

2. **Understanding the Reason (R):**
- The Reason states that the presence of a termination codon in mRNA causes protein synthesis to stop abruptly, regardless of whether the protein is fully synthesized.
- This is accurate; when a ribosome encounters a stop codon, it releases the polypeptide chain and halts translation.
- Therefore, Reason (R) is also **True**.

3. **Evaluating the Relationship Between A and R:**
- While both statements are true, the Reason does not provide a correct explanation for the Assertion.
- The Assertion identifies the amber codon as a termination codon, while the Reason explains the general function of termination codons without specifically addressing the nature of the amber codon.

4. **Conclusion:**
- Since both A and R are true, but R is not a correct explanation of A, the correct answer is: **Both A and R are true, but R is not the correct explanation of A.**

### Final Answer:
- The answer is: **Both A and R are true, but R is not the correct explanation of A.**