Thomas Hunt Morgan was an American evolutionary biologist, geneticist, and embryologist. In 1933, he won the Nobel Prize in Physiology or Medicine for discoveries on the role of chromosomes in heredity. The Nobel Prize in Physiology or Medicine 1933, announced October 20, 1933. Thomas H. Morgan, “for his discoveries concerning the role played by the chromosome in heredity”. Thomas H. Morgan: born 1866, Lexington, KY, USA. Wiki link Data: the Nobel Foundation (CC0).