Hen-feathered male Sebright bantam, bred by Thomas Hunt Morgan, United States, 1914-1924
Thomas Hunt Morgan (1866-1945) bred this pair of male Sebright Bantams (a type of chicken) in order to investigate the genetic inheritance of plumage. One male has the plumage and feathering normally associated with hens; the other has the plumage associated with cocks. Morgan found that the dominant gene for plumage is hen-feathering. Morgan won the Nobel Prize for Medicine in 1933 for discovering the role played by chromosomes in heredity.