Which of the following strains will be useful in demonstrating cis- regulation? In the genotypes listed below,the genes on the chromosome are on the left of the slash (/)symbol and the genes F' episome are on the right.

Question

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In strain B, the lacZ gene on the F' episome has a frameshift mutation (lacZS1) causing it to be non-functional, whereas the lacZ gene on the chromosome is functional (lacZ+). This demonstrates cis-regulation because the lacZ gene on the episome cannot complement for the non-functional lacZ gene on the chromosome due to the physical proximity of the two genes, which prevents the lacZ gene on the episome from functioning properly.

Which of the Following Strains Will Be Useful in Demonstrating