UPSC Prelims PYQ 1998: Match theories and scientists — Mutation, Evolution, One...
Match List I with List II and select the correct answer using the codes given below the lists:
List I
- Theory of Mutation
- Theory of Evolution
- One gene one enzyme hypothesis
- Operon concept
List II
- Beadle and Tatum
- Jacob and Monod
- Darwin
- De Vries
Codes:
a) I-C, II-D, III-A, IV-B
b) I-D, II-C, III-A, IV-B
c) I-D, II-C, III-B, IV-A
d) I-C, II-D, III-B, IV-A
Explanation
Option (b) is correct
- Hugo de Vries proposed the Theory of Mutation, stating that evolution occurs through sudden heritable changes called mutations rather than only gradual variations. Charles Darwin explained the Theory of Evolution through natural selection, according to which organisms with favourable traits survive and reproduce. George Beadle and Edward Tatum proposed the one gene–one enzyme hypothesis, establishing that each gene controls the production of a specific enzyme. François Jacob and Jacques Monod introduced the operon concept, explaining gene regulation in bacteria through examples such as the lac operon in E. coli.
Answer: (b) I-D, II-C, III-A, IV-B
