DNA Timeline

  • Gregor Mendel

    Gregor Mendel
    Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Law of Segregation,Law of Independent Assortment,Law of Dominance.
  • Rosalind Franklin

    Rosalind Franklin
    in 1953 got x-ray diffraction photos which formed basis of watson and cricks hypothesis.
  • Oswald Avery

    Oswald Avery
    Oswald found that DNA is what chromosomes and genes are made of.
  • Erwin Chargaff

    Erwin Chargaff
    He found two rules were to show that in natural DNA the number of guanine units equals the number of cytosine units and the number of adenine units equals the number of thymine units. The second of Chargaff's rules is that the composition of DNA varies from one species to another, in particular in the relative amounts of A, G, T, and C bases.
  • Hershey-Chase

    They identified DNA to be the genetic material of phages and, ultimately, of all organisms.
  • Linus Pauling

    Linus Pauling
    Linus proposed the idea of the triple stranded-helix structure for DNA
  • Watson & Crick

    Watson's key contribution was in discovering the nucleotide base pairs that are the key to the structure and function of DNA.
    Crick was an important theoretical molecular biologist and played a crucial role in research related to revealing the genetic code.
  • Roy Britten

    Birtten found that mouse cells contain multiple copies of very similar DNA sequences, by looking at the reassosiation rates of DNA strands
  • Pat Brown

    Pat Brown
    He identified DNA to be the genetic material of phages and, ultimately, of all organisms.
  • Mary-Claire King

    Mary-Claire King
    King and her colleagues proved the existence of the first gene to be associated with hereditary breast cancer, now known as BRCA1. Certain mutations in the BRCA1 gene are known to greatly increase a carrier’s chances of developing breast cancer.