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Q. No.Plasmid pUC18 carries lacZ gene that confers the host cells to convert white X-gal into blue indole. A gene is inserted within the lacZ gene of the plasmid. Bacterial cells transformed with this rDNA, if provided with X-gal in the medium, will produce:
| 1. | Blue colonies |
| 2. | White colonies |
| 3. | No colonies |
| 4. | Orange colonies if seen through UV light |
Subtopic: Selection of Recombinant Transformants |
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