The Years Of DNA

1865-Gregor Mendel shows us that the characteristics of pea plants are passed along in a predictable way. His discovery begins with the science of genetics.

1903-Walter Sutton shows us the the chromosomes carry the cell's units of inheritance.

1911-Thomas Hunt Morgan demonstrates that genes are arranged in linear fashion on the chromosomes of the fruit fly.

1928-Fredrick Griffith discovers that bacteria contain a molecule that can transfer genetic info. from cell to cell.

1944-Oswald Avery,Colin Macleod,and Maclyn McCarty show the substances that Griffith discovered is DNA.

1950-Erwin Chargaff analyzed the base composition of DNA in cells. He discovers that the amounts of adenine and thymine are almost always equal, as are the amounts of guanine and cytosine.

1952-Alfred Hersey and Martha Chase confirm that the genetic material of viruses is DNA, not protein. Rosalind Franklin records a critical X-ray diffraction pattern, demonstrating that DNA is in the form of the helix.

1953-James Watson and Francis Crick publish their model of the DNA double helix. The model was made possible by Franklins work.

2000-Craig Venter and Francis Collins announce the draft DNA sequence of the human genome at a White House ceremony in Washington D.C. The final version is published in 2003.

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