Structure of DNA

By Bec_dd

  • Gregor Mendel

    Gregor Mendel studied the heredity of pea plants and identified which characteristics are passed down through generations of species, identified workings of genes being passed down to offspring.

  • Friedrich Miescher

    Friedrich Miescher discovered deoxyribonucleic acid (DNA) in the nuclei of white human blood cells whilst attempting to isolate a nuclei from cytoplasm.

  • Theodor Boveri

    Theodor Boveri discovered that male sperm nuclei and female egg nuclei contained the same number of chromosomes and therefore the same amount of heredity information. He concluded that it was necessary for the correct amount of chromosomes to be present in order for correct embryonic development to occur.

  • Mendel

    Mendel's theories accepted into scientific community.

  • Walter Sutton

    Walter Sutton discovered that chromosomes are the basis of heredity and that the reduction of chromosomes in meiosis is directly linked to the laws of inheritance proposed by Mendel. He published a paper showing that chromosomes occurred in distinct pairs.

  • Phoebus Levene

    Phoebus Levene discovered the components of DNA and identified that the components were linked together in the order phosphate-sugar-base to form units. He proposed that DNA was made up of equal amounts of adenine, guanine, cytosine, and thymine.

  • Thomas Hunt Morgan

    Thomas Hunt Morgan examined the process by which a species changed over time, modelled on fruit flies. His work provided the proof for the chromosomal theory of heredity, genetic linkage, chromosomal crossing over and non-disjunction

  • Erwin Chargaff

    Erwin Chargaff discovers that DNA composition is specific to each species and that the amounts of adanine and thymine, cytosine and guanine have the same ratios as each other, being 1:1.

  • Roasalind Franklin and Maurice Wilkins

    Rosalind Franklin and Maurice Wilkins took X-ray diffraction images of DNA, leading to the discovery of its double helical structure.

  • Linus Pauling

    Linus Pauling proposed a three chained helix with a sugar-phosphate backbone at the centre.

  • James Watson and Francis Crick

    James Watson and Francis Crick work on molecular model of DNA and identify its structure in terms of double helix, hydrogen bonds and antiparallel orientation.