Assertion : Regulator and operator genes are not associated with contitutive genes.
Reason : Constitutive genes need not be repressed.

Options

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

Answer

A

Explanation

Constitution gene are those gene that are transcribed continually and at a relatively constant level regardless of the cell environmental condition. But, in lac operon operator gene switch on in the presence of inducer lactose which bind to repressor encoded by regulator
The constitutive genes keep on functioning all the time. They need not to be repressed. Therefore, the regulator and operator genes need not to be repressed.