Question

Watson and Crick’s discovery of double helical structure was based on which two findings. Also mention the name of the scientists associated with these findings.

Answer 1

They relied mainly on

1. Chargaff’s rules (that A = T and C = G) were discovered by Erwin Chargaff.
2. DNA X‑ray diffraction data showing a helical form produced by Rosalind Franklin and Maurice Wilkins.

Chargaff’s base‑composition rules implied specific base‑pairing, and the X‑ray patterns indicated a regular helical geometry; together, these allowed Watson and Crick to build the double‑helix model.