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Miescher isolated "nuclien" DNA with its associated proteins from cell nuclei, and he was first to identify DNA as a distinct molecule.
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Frederick Griffiths experiment was the first experiment suggesting that bacteria was capable of transferring genetic information. This process is known as transformation.
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Oswald Avery conducted a series of experiments to show that DNA was not a protein ( at the time people thought it was a protein ) but was a molecule that is responsible for bacterial transformation and the molecule of heredity.
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Erwin Chargaff discovered that amounts of adenine and thymine in DNA were roughly the same, as were the amounts of cytosine and guanine. This is known as the Chargaff's Rule.
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Rosalind Franklin and Maurice Wilkins were the first to discover the shape of DNA. They found out that DNA is in a double helix shape.
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Alfred Hershey and Martha Chase conducted a series of experiments that helped to confirm that DNA is a genetic material.
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Watson and Crick study about the structure of DNA and found that this molecule contained heredity information.
