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Arindam Paul posted an Question
November 11, 2020 • 11:17 am
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30 points
30 points
- IIT JAM
- Biotechnology (BT)
Roouced into the lacl mutant cell, what would be the phenotype of this partial diploid (also referred to as a merodiploid) ? d second wild type or normal copy o
rOouced into the lacl mutant cell, what would be the phenotype of this partial diploid (also referred to as a merodiploid) ? d second wild type or normal copy of the lacl gene (just lacl and not lacz, lacY, or lacA) is (A) The lac genes would be expressed efficiently only in the absence of lactose. (B) The lac genes would be expressed efficiently only in the presence of lactose. (C) The lac genes would be expressed continuously. (D) The lac genes would never be expressed efficiently.
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Anup Padwal![best-answer]()
Option C The lacI gene coding for the repressor lies nearby the lac operon and is always expressed (constitutive). If lactose is missing from the growth medium, the repressor binds very tightly to a short DNA sequence just downstream of the promoter near the beginning of lacZ called the lac operator. In option A and C there should be confusing, but the A option says absence of lactose. And negative regulation means when lactose very low. so we can eliminate option A.