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Frederick Griffith
Frederick Griffith discovered that DNA was inherited by injecting mice with two types of pneumonia, non-virulent and virulent pneumonia to see if they passed on each others characteristics. He called the passing of inheritance molecules transformation. -
Erwin Chargaff
Erwin Chargaff discovered the pattern of adenine, cytosine, guanine, and thymine in DNA. After taking samples of different cells he noticed that adenince was almost equal to thymine, and guanine was almost equal to cytosine. His discovery became known as Chargaff's Rule. -
Oswald Avery
Oswald Avery identified DNA as the transforming principle of specific proprties in bacteria after repeating Fredereick Griffith's experiment using pneumococcus bacteria and test tubes instead of mice. -
Alfred Hershey, Martha Chase
Alfred Hershey and Martha Chase proved that DNA was what formed genetic material and not proteins. In their experiment, they used a bacterium called ecoli and a virus called T2. After the T2 virus took over the ecoli it killed the cell. This lead Hershey and Chase to their conclusion that DNA was the genetic material. -
Francis Crick and James Watson
Francis Crick and James Watson discovered that the structure of DNA consisted of two chains twisted around each other by studying Roslind Franklin's X-ray crystallography pictures. -
Roslind Franklin
Roslind Franklin studied the structure of DNA using the x-ray crystallography pictures she took. Her pictures helped Watson and Crick determine the stucture of DNA.
