Discovering DNA Timeline

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A timeline of scientists' discoveries that led or helped with the discovery of DNA.

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Discovering DNA Timeline

  1. 1. Discovering DNA Timeline By: Ray Gleaves
  2. 2. Frederick Griffith-1928 <ul><li>Griffith discovered that in heat-killed, disease-causing bacteria has a factor that can change of “transform” harmless bacteria into bacteria that can cause disease. He tested this theory on mice. </li></ul>
  3. 3. Oswald Avery-1944 <ul><li> Avery and his colleagues repeated Griffith’s experiment, but they made an extract from the heat-killed bacteria. They treated the extract with enzymes that break down proteins, lipids, carbohydrates, other molecules, and RNA but transformation still occurred. They tried the experiment a second time, but used an enzyme that destroyed DNA. This time transformation did not occur. Avery and his colleagues discovered that DNA was the transforming factor. </li></ul>
  4. 4. Linus Pauling & Robert Corey-1951 <ul><li>Together, Pauling and Corey discovered that a helix is the structure of a class of proteins. </li></ul>
  5. 5. Rosalind Franklin-1952 <ul><li>Franklin studied the structure of DNA using x-ray diffraction. She worked very hard to make a better and clearer pattern. Here discoveries indicated that DNA has a helical structure. </li></ul>
  6. 6. James Watson & Francis Crick-1953 <ul><li>While Franklin was continuing her research, Watson and Crick were building 3-D models of DNA out of cardboard and wire. Their models were not correct or successful until they saw Franklin’s x-ray patterns. Then they were able to build a correct model of DNA which is a double helix. </li></ul>
  7. 7. Sydney Brenner-1960 <ul><li>Brenner, along with other scientist, discovered or rather showed the existence of messenger RNA (mRNA). </li></ul>
  8. 8. Walter Gilbert-1977 <ul><li>Gilbert, Frederick Sanger, and Allan Maxam were able to discover methods that enabled them/us to read the sequence of DNA. </li></ul>
  9. 9. Human Genome Project-2000 <ul><li>This project was in progress for thirteen years. It was an attempt to sequence all human DNA. It was completed in 2003. </li></ul>

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