What is gene theory?
George Beadle and Edward Tatum proposed that one gene was responsible for the production of one enzyme (the one gene one enzyme theory). In the mid-twentieth century, Oswald Avery showed that DNA was the molecule carrying the genes. Edwin Chargaff worked out the constant relationship between the bases within DNA. In 1953, James Watson and Francis Crick worked out the structure of DNA along with its method of replication.