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This question refers to the lac operon. Select the correct phenotype for the genotype: I--P--OcZ--/I+P--O+Z+ [Terminology:...

This question refers to the lac operon. Select the correct phenotype for the genotype:

I--P--OcZ--/I+P--O+Z+

[Terminology: β Galactosidase activity = β Gal activity]

Select one:

no β Gal activity, with no lactose (--) , β Gal activity with lactose (+)

no β Gal activity, with no lactose (--) , no β Gal activity with lactose (--)

β Gal activity, with no lactose (+) , β Gal activity with lactose (+)

β Gal activity, with no lactose (+) , no β Gal activity with lactose (+)

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Answer #1

no gal activity with no lactose (--) , no gal activity with lactose (--).

I--P--Oc Z-- / I+P--O+Z+

In case of I--P--OCZ-- ( no beta galactosidase will be formed due to mutation in promoter and mutation of Z structural gene . mutation in promoter does not allow the RNA polymerase to bind to the promoter as a result no transcription will occur.)

I+P--O+Z+ ( no beta galactosidase will be formed due to mutation in promoter . Mutation in promoter does not allow the RNA polymerase to bind to the promoter as a result no transcription will occur. promoter mutation are cis acting , recessive and uninducible in nature . Even though operator and Z gene is present but still no transcription will occur due to mutation in promoter).

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