dna historians

1. Frederick Griffith (1928) – Discovered transformation in bacteria; showed a “transforming factor” carries genetic info.

2. Avery, MacLeod & McCarty (1944) – Proved DNA is the transforming factor and genetic material.

3. Erwin Chargaff (1950) – Found base-pairing rules: A = T and G = C.

4. Hershey & Chase (1952) – Used viruses to show DNA, not protein, carries genes.

5. Rosalind Franklin (1952) – Took X-ray images showing DNA’s double-helix shape.

6. Watson & Crick (1953) – Built the double-helix DNA model using Franklin’s data.