Question

For each of the following genotypes associated with the lacoperon in E. coli, indicate with a...

For each of the following genotypes associated with the lacoperon in E. coli, indicate with a "+" or a "−" whether functional β-galactosidase would be produced in the following table:

β-galactosidase production

No Lactose     With Lactose

I+ = normal repressor

I- = mutant repressor

Is = mutant repressor

O+ = normal operator

Oc = constitutive operator

(1 Point)  Is Oc Z-/F'Is O+ Z+      

      β-galactosidase production

      No Lactose     With Lactose

A. + +

B. - -

C. + -

D. - +

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Homework Answers

Answer #1

Answer=(B) - -

Explanation-

In Merodiploid, strain 1 has mutant Beta-galactosidase (Z-) but strain 2 has functional Beta-galactosidase (Z+).

LacIs makes dominant repressor which is not bind to Inducer(allolactose) so this active repressor binds to normal operator(O+) region so RNA polymerase can't bind at promoter region so transcription of Beta-galactosidase (Z+) is inhibited in both condition (lactose present and lactase absent).

Rest all the options are incorrect regarding production of Beta Galactosidase (Z+).

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