Question

Match List I with List II
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Choose the correct answer from the options given below: }

• A. A-V, B-IV, C-I, D-II
• B. A-IV, B-V, C-I, D-II
• C. A-II, B-I, C-III, D-IV
• D. A-I, B-V, C-III, D-II

Hint:

Historical names are common in ICAR exams. Associate McClintock with Transposons and Benzer with the fine structure of the gene (cistron, muton, recon).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
This question requires matching historical terms and mechanisms in genetics and molecular biology with the scientists or contexts associated with them.

Step 2: Detailed Explanation:
- A. Gene: The term "gene" was coined by the Danish botanist Wilhelm Johannsen in 1909 to describe the fundamental units of heredity. (Match: A-II).
- B. Jumping gene: These are transposable elements or transposons. They were discovered by Barbara McClintock while working with maize in the 1940s and 50s. She received the Nobel Prize for this discovery in 19 (Match: B-I).
- C. Cistron: This term, describing a unit of function in a genetic map, was introduced by Seymour Benzer during his studies on the rII region of bacteriophage T4. (Match: C-III).
- D. Rolling circle replication: This model of DNA replication (e.g., in phage \(\phi\)X174) was elaborated by David Dressler. Note: John Cairns is famous for the 'theta' (\(\theta\)) form replication in E. coli, but Dressler is the key figure for the rolling circle mechanism. (Match: D-IV).
Following these historical associations, the correct sequence is A-II, B-I, C-III, D-IV.

Step 3: Final Answer:
Matching the scientific terms to their discoverers yields A-II, B-I, C-III, D-IV. Option 3 is correct.