The two different cells become mutated

The proteins expressed in each cell are different

They actually have different DNA in the two types of cells.

The genome of the different cells changes

lactose binds to the repressor

glucose binds to the repressor

lactose binds to the operator

the repressor binds to the operator

lactose is absent in the cell

glucose is present in the cell

lactose is present in the cell

At a ribosome

In the nucleus

In a prokaryotic cell

could be in the nucleus or the ribosome

mRNA / Amino Acid Chain

Amino Acid Chain / mRNA

Ribosome / Nucleus

mRNA / tRNA