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Friedrich Miescher identified DNA as a molecule in 1869. Nucleic acids were discovered.
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Archibald Garrod linked proteins to genetic traits.
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British scientist Frederick Griffith performed research using mice and disease-causing strains of bacteria to come up with a hypothesis on TRANSFORMATION.
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Frederick Griffith publishes the results of his experiments : he showed that information contained in a factor was able to change benign bacteria into a harmful bacteria.
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Based on Griffith's research, Oswald Avery publishes the results of his own experiment in 1944: DNA is what stores and sends genetic information from one generation to the next.
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Alfred Hershey and Martha Chase ran a series of ecperiments to confirm that DNA was the genetic material in organisms. Viruses were used to prove this.
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Erwin Chargaff discovered that the corresponding nucleotide bases in DNA appear in equal ratios. Chargaff's Rule: amount of adenine = amount of thymine; amount of cytosine = amount of guanine.
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Rosalind Franklin used x-rays to figure out the repeating structure of a DNA molecule. Her research was important to the creation of the Watson-Crick model.
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Watson and Crick published their paper describing the double helix structure of the DNA molecule.
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Cohen and Boyer discover the ability to combine genes from two different bacteria into a single DNA molecule.
