Assertion: Recombinant colones will produce blue colour in the medium having X-gal compound
Reason :The 'gal gene' of vecotr undergone insertional inactivation

Options

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

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "recombinant colonies will produce blue color in the medium having X-gal compound." In molecular biology, X-gal is used in blue-white screening to differentiate between recombinant and non-recombinant colonies.

2. **Understanding the Reason**: The reason provided is that "the gal gene of the vector underwent insertional inactivation." Insertional inactivation occurs when a foreign DNA is inserted into a gene, disrupting its function.

3. **Analyzing the Role of X-gal**: X-gal is a substrate for the enzyme beta-galactosidase. If the beta-galactosidase is produced (which occurs in non-recombinant colonies), it hydrolyzes X-gal, leading to the formation of a blue pigment.

4. **Determining the Color of Colonies**:
- **Non-recombinant colonies** (which have an active beta-galactosidase) will appear blue because they can hydrolyze X-gal.
- **Recombinant colonies** (which have undergone insertional inactivation of the gal gene) will not produce beta-galactosidase and will appear white.

5. **Conclusion**: Based on the above analysis:
- The assertion that recombinant colonies produce blue color is **false**.
- The reason that the gal gene has undergone insertional inactivation is **true**, but it does not correctly explain the assertion.

6. **Final Answer**: Both the assertion and the reason are false.