Dna

Discoveries in DNA

By brichie13
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    Gregor Mendel's Pea Plant Experiments

    Mendel published his work on the heredity of peas in 1866 in which he noted that genes are passed from parent to offspring during reproduction.

  • Frederick Griffith discovers "transforming factor"

    Frederick Griffith discovers "transforming factor"
    Griffith's Experiment In an experiment with lab mice, Frederick Griffith transfers the deadly component of a strain of pneumonia bacteria to an innocuous bacteria strain, and determines there must be a genetic "transforming factor" in the bacteria.

  • Components of DNA Discovered

    Components of DNA Discovered
    Phoebus Levene discovers that the sugar deoxyribose is present in nucleic acids and later shows that DNA is made up of nucleotides, which are made up of a deoxyribose sugar, a phosphate group, and one of four bases.

  • DNA is the "transforming factor"

    DNA is the "transforming factor"
    Oswald Avery, Colin MacLeod, and Maclyn McCarty show that DNA, and not protein, is the "transforming factor" Griffith first identified.

  • Chargaff's Rule

    Chargaff's Rule
    Chargaff's rules Erwin Chargaff shows there are equal amounts of the nucleotides adenine (A) and thymine (T) as well as equal amounts of guanine (G) and cytosine (C), i.e. there is an A for every T and a G for every C.

  • Hershey and Chase Experiment

    Hershey and Chase Experiment
    Alfred Hershey and Martha Chase show that viral DNA and not viral protein direct the replication of new viruses, confirming that DNA is the molecule that mediates heredity.

  • Structure of DNA Discovered - The Double Helix

    Structure of DNA Discovered - The Double Helix
    Watson and Crick James Watson and Francis Crick describe the three-dimensional structure of DNA as a double helix: two spiraling strands held together by complimentary base pairs.

  • The Genetic Code gets cracked

    The Genetic Code gets cracked
    Marshall Nirenberg, H. Gobind Khorana, Francis Crick, George Gamow, and other scientists crack the genetic code -- sixty-four nucleotide triplets that constitute a universal genetic code for all cells and viruses.

  • DNA gets sequenced

    DNA gets sequenced
    Sanger Sequencing Animation Fred Sanger and others sequence DNA.

  • PCR is Developed

    PCR is Developed
    PCR PCR, to date the most accurate and sensitive method for amplifying DNA, is developed by Kary Mullis.

  • Human Genome Sequenced

    Human Genome Sequenced
    Human Genome Project Announcement of the final completion of the human genome sequence.