The lac operon will function normally.Thus, these mutations permit the lac operon to continue being transcribed (and subsequently expressed) even in the absence of an inducer; this is known as constitutive expression.
The repressor is unable to bind with the operator due to a mutation in the lac I gene. Even in the absence of lactose, transcription will still occur if the repressor does not bind the operator and RNA polymerase moves to the transcription site.
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