Below is the E coli genotype functional diploid for the Lac

Below is the E. coli genotype (functional diploid for the Lac operon). Will this genotype produce B-galactosidase? lacI + ……… p + o c lacZ + lacY + lacA - = chromosomal DNA lacI + ……… p + o + lacZ - lacY + lacA - = plasmid DNA

A. B-galactosidase will only be expressed in the presence of lactose.

B. The lacI repressor is wild-type, so it will repress expression of B-galactosidase.

C. B-galactosidase will be made continuously.

D. B-galactosidase will never be made, because the lacZ- coding region is defective.

E. none of the above

Solution

As the operative gene is in constitutive mode, the all functional genes which is under Oc will be expressed continuosly.

So, the answer C is correct answer.

C. B-galactosidase will be made continuously.