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    Mutations Affecting the Function of the Lac Operon

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    Mutations can alter the function of an operon. Predict how the following mutations would affect the function of the lac operon in the presence and absence of allolactose (lactose). Please indicate if transcription will occur or if transcription will not occur. If this result is the same as what would have occured without the mutation, indicate that it is normal. If the mutation has altered whether or not transcription would occur please indicate abnormal.

    a. mutation of regulatory gene; repressor will not bind to lactose
    presence of allolactose (transcription or no transcription, normal or abnormal)
    absence of allolactose (transcription or no transcription. normal or abnormal)
    b. mutation of operator; repressor will not bind to operator
    absence of allolactose (transcription or no transcription, normal or abnormal)

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    Solution Preview

    a. mutation of regulatory gene; repressor will not bind to lactose
    presence of allolactose-no transcription (repressor will not leave the ...

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