Assertion A: The lacZ gene is present on pUC cloning vectors as the selectable marker by which recombinants may be selected through insertional inactivation of the lacZ gene. Reason R: IPTG acts as a gratuitous inducer of lacZ genes due to which recombinants produced in pUC vectors may be selected by Blue-white screening. In the light of the above statements, choose the correct answer from the options given below:
1
Both A and R are true and R is the correct explanation of A
2
Both A and R are true but R is NOT the correct explanation of A
3
A is true but R is false
4
A is false but R is true