Morgan, Thomas Hunt (1866–1945)
Thomas Morgan was an American biologist who, through his experiments with the fruit fly Drosophila, established the relation between genes and chromosomes and thus the mechanism of heredity. For his work he received the 1933 Nobel Prize in Physiology or Medicine. His discovery of the function of chromosomes is related in his book The Theory of the Gene (1926, rev. ed. 1928).