An E. coli strain that is lac I is conjugated with E. coli cells carrying an F' plasmid with the PI lac I DNA sequence on the episome. How would the expression of the lac Z be regulated in the resulting cells that are diploid and heterozygous for the lac I gene (lac I on episome and lac I on the bacterial chromosome)?

A.	normal regulation of lactose metabolism.
B.	constitutive expression of lac Z+.
C.	inability to synthesize the lac Z+ gene product, ß-galactosidase.
D.	lac Z+ gene is inducible, but unable to be repressed by high glucose.
E.	no synthesis of the lac I gene product, the lac repressor.