1903 - Walter Sutton shows that 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 contains a molecule that can transfer genetic information from cell to cell.
1944 - Oswald Avery, Colin Macleod, and Maclyn McCarty show the substance that Griffith discovered is DNA.
1952 - Alfred Hershey and Martha Chase confirm that genetic material of viruses is DNA, not protein. Rosalind Franklin records a critical X-Ray diffraction problem, demonstrating that DNA is From of a helix.
2000 - Craig Venter and Francis Collins announce the draft DNA sequence of the human genome at the White House Ceremony in Washington, DC.