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. Rosalind Franklin's X - ray crystallography data was crucial but she didn't develop the model alone. Marshall Nirenberg and Heinrich Matthaei were involved in deciphering the genetic code, and Erwin Chargaff formulated Chargaff's rules.

Answer:

A. James Watson and Francis Crick