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NEETZoologyMolecular Basis of Inheritance

Which gene codes for the repressor of the lac operon?

Options

  1. Aa gene
  2. By gene
  3. Cz gene
  4. Di gene

Correct answer

D. i gene

Step-by-step solution

The lac operon consists of one regulatory gene (the i gene – here the term i does not refer to inducer, rather it is derived from the word inhibitor) and three structural genes (z, y, and a). The i gene codes for the repressor of the lac operon . The z gene codes for beta-galactosidase (β-gal), which is primarily responsible for the hydrolysis of the disaccharide, lactose into its monomeric units, galactose and glucose. The y gene codes for permease, which increases permeability of the cell to β-galactosides. The g

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