Question

in 1953, who developed the model that is shown below? james watson and francis crick marshall nirenberg and heinrich matthaei rosalind franklin erwin chargaff

Explanation:

In 1953, James Watson and Francis Crick developed the double - helix model of DNA. Marshall Nirenberg and Heinrich Matthaei were involved in deciphering the genetic code. Rosalind Franklin's X - ray crystallography data was crucial for the discovery but she didn't develop the model alone. Erwin Chargaff's rules about base - pair ratios were important but he didn't develop the model.

Answer:

A. James Watson and Francis Crick