A partial diploid containing a wild type allele for lacO and a lacO mutant that was unable to bind to the lac repressor would always express β-galactosidase.

Question

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Because the lacO mutant is unable to bind to the lac repressor, the lac operon will always be on (constitutive), regardless of the presence or absence of lactose. Therefore, β-galactosidase will be expressed.

A Partial Diploid Containing a Wild Type Allele for LacO