In a bacterial cell,the three genes of the lactose operon are

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The lactose operon is a cluster of three genes (lacZ, lacY, and lacA) that are only expressed in the presence of lactose or lactose analogs. The presence of lactose induces the transcription of the operon by binding to the Lac repressor protein and preventing it from binding to the operator site. This allows RNA polymerase to bind to the promoter site and initiate transcription of the genes. In the absence of lactose, the repressor protein binds to the operator site, preventing RNA polymerase from transcribing the genes.

In a Bacterial Cell,the Three Genes of the Lactose Operon