Question

Which of the following summarizes expression of the lac genes in this partical diploid: I+ P+ Oc Z− Y+ / I− P+ O+ Z+ Y− ? Which of the following summarizes expression of the lac genes in this partical diploid: I+ P+ Oc Z− Y+ / I− P+ O+ Z+ Y− ? Beta-galactosidase is made both in the presence of and in the absence of lactose; permease is only made when lactose is present. Both permease and beta-galactosidase are made both in the presence of and in the absence of lactose. Both permease and beta-galactosidase are made only when lactose is present. Permease is made both in the presence of and in the absence of lactose; beta-galactosidase is only made when lactose is present.

Answer 1

Option (4).

Step-by-step explanation:

Lac operon is present in E.coli that regulate the metabolism of lactose in the bacteria. Lac Operon consists of three genes : Lac Y, lac Z and lac A, an operator and a promoter.

I+ P+ Oc Z− Y+ / I− P+ O+ Z+ Y− , in this case inducer is present, promoter is present, constitutive region and the gene lac Z and lac Y indicates the Z and Y. The permease enzyme will made in the presence and absence of lactose due to the presence of I+ P+ Oc in the cell but beta galactosidase is only made in presence of lactose as Y− gene is present in the diploid cell.

Thus, the correct answer is option 4.