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:

The model shown is the double - helix structure of DNA. In 1953, James Watson and Francis Crick developed this model. Marshall Nirenberg and Heinrich Matthaei worked on cracking the genetic code. Rosalind Franklin's X - ray diffraction images were crucial for understanding DNA structure but she did not develop the model. Erwin Chargaff discovered base - pairing rules (Chargaff's rules) but not the double - helix model.

Answer:

James Watson and Francis Crick