Assertion :- The gene I codes for the repressor of the lac operon.
Reason : The y-gene codes for permease, which increases permeability of the cell to `beta`-galactosidase.

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 the gene I codes for the repressor of the lac operon. This is indeed true. The lac operon consists of several genes, and the I gene (or lacI) produces a repressor protein that binds to the operator region of the operon, preventing transcription when lactose is absent.

2. **Understanding the Reason:**
- The reason given is that the y-gene (more commonly referred to as the lacY gene) codes for permease, which increases the permeability of the cell to beta-galactosidase. This statement is partially true; the lacY gene does code for permease, but the permeability it increases is specifically for lactose, not beta-galactosidase. Beta-galactosidase is the enzyme that breaks down lactose into glucose and galactose.

3. **Analyzing the Relationship:**
- Since the assertion is true (the I gene does code for the repressor), and the reason is false (the lacY gene increases permeability to lactose, not beta-galactosidase), we conclude that the assertion is correct, but the reason provided is incorrect.

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