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Frederick Meischer

1869

He was the first to isolate DNA.

Griffith (Fred)

1928

he showed how different diseases can transform or change.

Beadle and Tatum

1941

They created and analyzed mutants of neurospora to show how genes directed to the synthesis of enzymes that control metabolic processes.

Avery and McCleod

1944

They thought DNA created a transformation in cells.

Erwin Chargoff

1944

He developed the Chargoff Rule which states that the number of purines in DNA is equal to the amount of pyrimidines. G+A=T+C

Rosalind Franklin

1951

She used x-ray diffraction to determine the structure of DNA.

Watson and Crick

1953

Watson and Crick discovered that DNA was a double helix shape. They won the Nobel prize for their work in physiology.

Nirenberg (Marshall)

1961

He discovered how DNA is directed to the expression of proteins, and what role RNA had in these processes.

Maurice Wilkins

1962

He discovered the structure of molecular nucleic acids.