Genetic Engineering B-galactosidase gene (lacZ) Ampicillin-resistance gene(ampR) Restriction Plasmid site Plasmid DNA and foreign DNA are both cut with the same restriction enzyme. Foreign DNA Restriction sites Foreign DNA is inserted into the plasmid, Recombinant where it inactivates the lacZ gene. plasmid Figure 9.11.1Genetic Engineering Figure 9.11.1