UPSC Prelims 1998 · General Studies
Question 119: Science and Technology
Match List I with List II and select the correct answer using the codes given below the lists: List I I. Theory of Mutation II. Theory of Evolution III. One-gene-one-enzyme hypothesis IV. Operon concept List II A) Beadle and Tatum B) Jacob and Monod C) Darwin D) De Vries
AnswerThe answer is (b).
Hugo de Vries proposed the theory of mutation, Charles Darwin the theory of evolution by natural selection, George Beadle and Edward Tatum the one-gene-one-enzyme hypothesis, and Francois Jacob and Jacques Monod the operon concept of gene regulation. So I-D, II-C, III-A, IV-B.
- I. The theory of mutation is De Vries's (D).
- II. The theory of evolution is Darwin's (C).
- III. One-gene-one-enzyme is Beadle and Tatum's (A).
- IV. The operon concept is Jacob and Monod's (B).
Why each option is right or wrong
- (a) Mutation is De Vries's, and evolution is Darwin's, so I and II are reversed.
- (b) Right: mutation-De Vries, evolution-Darwin, one gene-one enzyme-Beadle and Tatum, operon-Jacob and Monod.
- (c) Swaps one gene-one enzyme (Beadle and Tatum) with the operon (Jacob and Monod).
- (d) Swaps mutation with evolution, and one gene-one enzyme with the operon.
Explanation: written by UPSC Grade, not by UPSC.
Source: UPSC, Civil Services (Preliminary) Examination 1998, General Studies. UPSC's own paper isn't online; the words are from a published compilation. The paper on upsc.gov.in.