George Beadle

George Wells Beadle (October 22, 1903June 9, 1989) was an American molecular biologist and geneticist. He was awarded the Nobel Prize in Physiology or Medicine with Edward Lawrie Tatum for their discovery of the role of genes in regulating biochemical events within cells.


  • Ionizing radiation has always been with us and will be for all foreseeable time. Our genetic system is probably well adjusted by natural selection to normal background radiation. Added radiation will increase the frequency of mutations; most of these will be harmful. Exposure to radiation in large amounts will increase malignant disease; small amounts may possibly do the same. In view of these potentially harmful effects every reasonable effort should be made to reduce the levels of ionizing radiation to which man is exposed to to the lowest levels that can reasonably be attained.
    • in Scientific American, September 1959
Last modified on 12 August 2012, at 03:22