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DNA Molecule Shape
The race to determine how the pieces fit together in a three-dimensional structure was won by James Watson and Francis Crick at the Cavendish Laboratory in Cambridge, England. They showed that alternating deoxyribose and phosphate molecules form the twisted uprights of the DNA ladder. The rungs of the ladder are formed by complementary pairs of nitrogen bases.(not actual date but the actual year.) -
DNA Polymerase
Arthur Kornberg isolates DNA polymerase, an enzyme that create DNA molecules and will be used for many kinds of recombinant DNA techniques and sequencing. (year 1955, actual month and day not known) -
Semiconservative Replication of DNA
Matthew Meselson and Franklin Stahl discover that DNA replicates semiconservatively, each strand of DNA molecule from the parent generation pairing with a strand from the daughter generation. (actual date not known) -
Crime Conviction
An international team of scientists began the project to map the human genome. The first crime conviction based on DNA fingerprinting, in Portland Oregon. Was completed in April, 2003. (actual date: unknown; year is accurate) -
Forensic Cases
DNA testing in forensics cases gains fame in the O.J. Simpson trial. The Simpson trial introduced the world to DNA testing, which later freed many wrongly imprisoned inmates thanks to the Innocence Project.
(actual date:unknown; year is accurate) -
DNA barcoding: a new tool for food traceability
DNA barcoding is a molecular based system, which allows scientists to identify particular species, by comparing short genetic markers in the specimen DNA with reference sequences. It was developed by Paul Herbert's researcher group at the University of Guelph in Canada. (actual date: unknown; 2003 is the actual year.)
