Discoveries and Scientists in Genetics
Which of the following pair is/are correctly matched-
- One gene-one enzyme theory: Beadle & Tatum
- Term heterosis: G.H. Shull
- Operon-concept: Jacob & Monod
- All are correct — Correct Answer
Explanation:
Correct Answer: All are correct
All three scientist-discovery pairs are accurately matched and represent landmark contributions to genetics.
Scientists and Their Contributions — Genetics
| Scientist(s) | Contribution | Details |
|---|---|---|
| Beadle & Tatum | One gene–one enzyme hypothesis | Demonstrated using Neurospora crassa (bread mould) mutants that each gene controls one specific enzyme step in a metabolic pathway (1941) |
| G.H. Shull | Term 'heterosis' / hybrid vigour | Coined the term 'heterosis' to describe the superiority of F1 hybrids over their parents (1914) |
| Jacob & Monod | Operon concept (gene regulation) | Discovered the lac operon — model for gene regulation in prokaryotes; explains how genes are switched ON/OFF (1961) |
Additional Key Scientists from Notes
| Scientist | Contribution |
|---|---|
| Gregor Johann Mendel | Father of Genetics |
| Hugo de Vries | Term 'mutation'; Mutation Theory of Evolution |
| Watson & Crick | Double helical model of DNA |
| Morgan | Sex-linked inheritance; chromosome theory of sex determination |
| Barbara McClintock | Transposons (jumping genes) |
| Karl Landsteiner | Blood groups and Rh factor |
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
