A Mutation in the I Gene Encoding the Lac Operon

A mutation in the i gene encoding the lac operon repressor protein causes this protein to lose its ability to bind to the operator site. Which would you expect to observe in an E. coli population having this mutation?

A) The cells would die if lactose were the only energy source available.
B) The cells would require lactose as their only energy source.
C) The cells would not be able to express lac genes when lactose is present.
D) The cells would express lac genes when lactose is absent.

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