In an E. Coli strain i gene gets mutated and its product can not bind the inducer molecule. If growth medium is provided with lactose, what will be the outcome?
Only z gene will get transcribed
z, y, a genes will be transcribed
z ,y ,a genes will not be translated
RNA polymerase will bind the promoter region
In the lac operon, the i gene produces a repressor protein. If the i gene is mutated such that the repressor cannot bind the inducer (lactose), the repressor will remain bound to the operator region even in the presence of lactose. This prevents RNA polymerase from transcribing the structural genes (z, y, a). Therefore, the genes will not be transcribed and consequently not translated.
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