Question

In the following diploid I-P+O+Z+Y-/I-P+O+Z-Y+ the Beta-galactosidase gene is Select one: A. inducible B. uninducible C....

In the following diploid I-P+O+Z+Y-/I-P+O+Z-Y+ the Beta-galactosidase gene is

Select one:

A. inducible

B. uninducible

C. constitutive

D. all of the above

E. none of the above

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Answer #1

The lac I gene encodes for Lac repressor and inhibits the expression of Z, Y and A gene. In above condition lac I​​​​​​-   means either lacI mutant will not form repressor OR repressor will not able to bind with operator. lac I​​​​​​-  mutant are generally recessive in nature. If there is no repressor OR repressor is not bind with operator, expression of genes Z, Y and A will be constitutive. Hence in above Lac I​​​​​​- haploid, expression of Beta-Galactosidase gene (Z) will be consitutive. So C option "Constitutive" is the correct option.

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