in a bacterium, there is a mutation in the gene for the repressor protein of the lac operon. the mutation has changed a codon in the mrna from ucu to ucc. when lactose is present, how would this mutation affect the function of the lac operon?

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01-12-2022
Biology

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in a bacterium, there is a mutation in the gene for the repressor protein of the lac operon. the mutation has changed a codon in the mrna from ucu to ucc. when lactose is present, how would this mutation affect the function of the lac operon?

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akursharma9034 akursharma9034 · Answer 1 · 2022-12-06T01:42:50-05:00

The phenotypic effect would be that the lactase structural enzymes would be produced uncontrollably (wouldn't be able to stop the transcription) if the repressor gene underwent a mutation that prevented the repressor protein from binding to the operator.

Constitutive expression results from mutations in the repressor that prevent it from binding to the operator. A non-inducible phenotype results from mutations that block the inducer's ability to bind without affecting the operator's ability to bind.

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