The double helix structure of DNA was proposed in 1953 by
- A. Mendel and Morgan
- B. Griffith and Avery
- C. Watson and Crick, using the X ray diffraction data of Rosalind Franklin
- D. Sanger and Gilbert
Explanation
Watson and Crick built the model from Franklin's X ray photographs, which showed the helix and its dimensions, together with Chargaff's finding that A equals T and G equals C. The structure immediately suggested how the molecule could be copied, since each strand is a template for the other. Griffith and Avery had earlier shown that DNA is the transforming material, and Sanger later developed sequencing.
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