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 and Stahl

Explanation

To determine which scientist had no contribution to the development of the double helix model for the structure of DNA, we can analyze the contributions of each of the scientists mentioned in the options.

1. **Identify the Scientists and Their Contributions**:
- **Rosalind Franklin**: She contributed significantly to the understanding of DNA structure through her X-ray diffraction images, which were crucial in revealing the helical structure of DNA.
- **Morris Wilkins**: He also worked on X-ray diffraction studies of DNA and collaborated with Franklin, providing important data that aided in the development of the double helix model.
- **Erwin Chargaff**: He is known for Chargaff's rules, which state that in double-stranded DNA, the amount of adenine equals thymine, and the amount of guanine equals cytosine. His findings were essential for understanding base pairing in DNA.
- **Matthew Meselson and Franklin Stahl**: They conducted experiments that demonstrated the semi-conservative nature of DNA replication, but they did not contribute to the initial model of DNA structure.

2. **Analyze the Question**:
The question asks for the scientist who had no contribution to the development of the double helix model.

3. **Determine the Correct Answer**:
Based on the contributions:
- Rosalind Franklin, Morris Wilkins, and Erwin Chargaff all contributed to the understanding of DNA structure.
- Matthew Meselson and Franklin Stahl focused on DNA replication and did not contribute to the double helix model.

Thus, the correct answer is **Matthew Meselson and Franklin Stahl**.

### Step-by-Step Solution:
1. Identify the scientists mentioned in the question.
2. Research their contributions to the field of DNA structure.
3. Analyze who among them contributed to the double helix model.
4. Conclude that Matthew Meselson and Franklin Stahl had no contribution to the double helix model.