NEETZoologyMolecular Basis of Inheritance
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The repressor of the lac operon is synthesised constitutively (all the time) from the i gene. Reason (R): The i gene derives its name from the word inhibitor and it codes for the repressor protein. In the light of the above statements, choose the most appropriate answer from the options given below
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
Step-by-step solution
Assertion (A) is correct because the i gene is a regulatory gene that is transcribed continuously, meaning the repressor protein is synthesised constitutively (all the time) in the cell. Reason (R) is also correct. The term i in the i gene does not stand for inducer; rather, it is derived from the word inhibitor. The i gene codes for the repressor protein of the lac operon. However, (R) is not the correct explanation of (A). The constitutive synthesis of the repressor is a property of its continuous transcription,