Discovery+of+DNA

====In 1928 Griffith tested two different strains of one umonia bacteria from mice. He discovered transformation which is basically the process in which one strain of bacteria is changed by a gene or many genes from another strain of bacteria. In 1944 Avery discovered that nucleic acids, DNA stores aswell as transmits the genetic information from one generation of an organism to another generation of an organism. In 1952 an experiment was conducted it was called the Hershey-Chase Experiment. They used bacteriophage which is a virus that infects bacteria sometimes it is called a phage as well. The experiment ended up concluding that genetic material of the bacteriophage was DNA not a protein. In 1952 X-Ray evidence was found. Rosalind Franklin used x-ray diffraction to get information about the structure of DNA molecules. This showed that the strands of DNA that were twisted looked like a helix, an angle of X also suggested two strands in the structure, and a nitrogenous base close to the center of the molecule. In 1953 James Watson along with Francis Creek made up a model of DNA. In this model two strands were wound around each other, base pairing.====