The phenotype of a lacI mutant that has the lacI gene partially deleted is constitutive expression of β-galactosidase.

Question

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A partial deletion of the lacI gene can result in a lacI mutant that still produces a functional but truncated lac repressor protein that cannot effectively repress the lac operon. This results in the constitutive expression of β-galactosidase even in the absence of lactose, leading to a constitutive phenotype.

The Phenotype of a LacI Mutant That Has the LacI