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Frederick Griffith
GFriffith concluded that something from the dead strain S bacteria had converted strain R bacteria into strain S bugs. He called it the "transforming principles." When he did this experiment, he was in Britain. He ingected four different mice with four different strains. -
Oswald Avery
He had the same set up as Frederick Griffith but used purified DNA Strains. Rather than protein as widly believed at the time, may be the hereditary material of bacteria. Rockefeller Institute for Medical Research. -
Maurice Wilkins
By November 1951 Wilkins had evidence that DNA in cells as well as purified DNA had a helical structure. Originated in England. -
Rosalind Franklin
It was an experiment presented in November 1951. Where she presented to those present, among them Watson, the two forms of the molecule, type A and B, and her position whereby the phosphate units are located in the external part of the molecule. Originated from England -
Alfred Hershey and Martha Chase
Using a high apeed blender they were able to force the bacteriophages from the bacterial cells after adsorption. The lack of labeled DNA remaining in the solution after the bacteriophages had been allowed to absorb the bacteria showed that the phage DNA was transferred into the bacterial cell. The presence of almost all the radioactive in the solution showed that the protein coat that protects the DNA before adsorption stayed outside the cell. Concluded that DNA,not protein, was genetic material -
James Watson and Francis Crick
After realizing the structural similarity of the AT and CG pairs, Watson and Crick soon produced their double helix model of DNA with the hydrogen bonds at the core of the helix.