Question

Match List-I with List-II

List-I: Scientist & List-II: Discovery
(A). T.H. Morgan & (I). Chromosomal non-disjunction
(B). Calvin B Bridges & (II). Divisibility of gene in Drosophila
(C). Clarence P Oliver & (III). Deletion mapping
(D). Seymour Benzer & (IV). Chromosomal theory of inheritance
Choose the correct answer from the options given below:

• (A) - (I), (B) - (IV), (C) - (II), (D) - (III)
• (A) - (III), (B) - (I), (C) - (IV), (D) - (II)
• (A) - (IV), (B) - (I), (C) - (II), (D) - (III)
• (A) - (IV), (B) - (I), (C) - (III), (D) - (II)

Hint:

To remember:
- Morgan: Gene linkage and Chromosomal theory.
- Bridges: Non-disjunction (the proof of chromosome-gene connection).
- Benzer: Phage genetics and Deletion mapping.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
The field of genetics developed through key experimental discoveries regarding chromosomes, recombination, and the physical structure of genes.

Step 3: Detailed Explanation:
Let us match each scientist with their discovery:
- (A). T.H. Morgan: Thomas Hunt Morgan's work with the fruit fly Drosophila melanogaster proved that genes are located on chromosomes.
His experiments provided the first definitive proof supporting the Chromosomal Theory of Inheritance, matching (IV).
- (B). Calvin B Bridges: Bridges, a student of Morgan, studied unexpected genetic ratios in Drosophila eye color.
His research demonstrated that these deviations were caused by the failure of chromosomes to separate properly, discovering chromosomal non-disjunction, matching (I).
- (C). Clarence P Oliver: Oliver demonstrated that crossing over can occur within a single genetic locus (specifically the lozenge locus in Drosophila).
This proved that the gene is not an indivisible unit of recombination, establishing the divisibility of the gene, matching (II).
- (D). Seymour Benzer: Benzer used overlapping deletions in the rII region of bacteriophage T4 to map point mutations rapidly.
His work established the technique of deletion mapping, matching (III).
This gives the matching: (A) - (IV), (B) - (I), (C) - (II), (D) - (III).

Step 4: Final Answer:
The correct match is Option (C).