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

Explain Operator gene.

Explain Regulator gene.

Assertion: Constitutive genes are also known as house keeping genes. Reason: Constitutive genes fail to express, as their products are not required for essential normal activities.

Gene regulation And One gene One enzyme Hypothesis

In operon model, regulator gene :

In operon model, regulator gene