1928, Grifiths - he discovered the transforming principle by which bacteria. an take up and inherent genetic material from their environment., 1944, Avery et al - proved that DNA is the hereditary material of the cell and discovered that DNA is the carrier of genetic information, 1950, Chargaff - He discovered that in any double stranded DNA, the amount of A always equals T and the amount of G always equals C, 1952, Hershey and Chase - He proved that DNA is the genetic information, 1951-53, Franklin and Wilkins - He revealed the 3D structure of DNA- And discovered that DNA has a double helix structure with the sugar phosphate backbone on the outside, 1953, Watson and Crick - Discovered that the DNA molecule exists in the form of a three dimensional double helix

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