Early Research in Genetics
A timeline of DNA history:
1866 - Gregory Mendel observes that certain 'factors' were passed on from parent to offspring during his work on the hereditary of pea plants. These 'factors' would later become known as genes.
1869 - Friedrich Miescher identifies an acidic substance from the nuclei of cells derived from soiled bandages. The substance was initially called 'nuclein', but would eventually be known as deoxyribonucleic acid, or DNA.
1928 - Frederick Griffith observes that a 'transforming factor' was responsible for changing the properties of bacteria. The experiment consisted of injecting a dead strain of disease-causing bacteria into a mice, along with a live strain that doesn't cause disease. The result was that the live strain became virulent by obtaining some component from the dead strain.
1929 - Phoebus Levene concludes that DNA is made up of nucleotides which consist of a sugar, phosphate group, and a base.
1944 - Several scientists, including Oswald Avery, determine that the 'transforming factor' observed by Frederick Griffith was DNA and not a protein.