Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA

Options

A. Rosalind Franklin
B. Maurice Wilkins
C. Erwin Chargaff
D. Meselson & Stahl

Answer

To solve the question "Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA?", we will analyze each of the options provided.

### Step-by-Step Solution:

1. **Identify the Scientists Listed**:
- Option 1: Rosalind Franklin
- Option 2: Maurice Wilkins
- Option 3: Erwin Chargaff
- Option 4: Meselson and Stahl

2. **Evaluate Contributions**:
- **Rosalind Franklin**: She was instrumental in the discovery of the DNA double helix structure through her X-ray diffraction images of DNA. Her work provided critical evidence for the helical structure of DNA.
- **Maurice Wilkins**: He also contributed to the understanding of DNA structure using X-ray diffraction techniques. Wilkins worked closely with Franklin and shared the Nobel Prize with Watson and Crick for their contributions to the discovery of the DNA structure.
- **Erwin Chargaff**: He is known for Chargaff's rules, which state that in DNA, the amount of adenine equals thymine and the amount of cytosine equals guanine. His work was fundamental in understanding the base pairing in DNA, which is crucial for the double helix model.
- **Meselson and Stahl**: They are known for their experiments that demonstrated the semi-conservative replication of DNA. However, they did not contribute to the development of the double helix model itself.

3. **Conclusion**:
- Based on the contributions discussed, the scientist who had no contribution in the development of the double helix model for the structure of DNA is **Meselson and Stahl** (Option 4).

### Final Answer:
The correct answer is **Option 4: Meselson and Stahl**.