Thomas Hunt Morgan (1866 –1945) was an American evolutionary biologist, geneticist and embryologist. Following the rediscovery of Mendelian inheritance in 1900, Morgan's research moved to the study of mutations in the fruit fly Drosophila melanogaster. He demonstrated that genes are carried on chromosomes and are the mechanical basis of heredity. These discoveries formed the basis of the modern science of genetics and earned him the Nobel Prize in Physiology and Medicine in 1933.
The Comoro Island issued in 1977 the following stamp depicting several Noble Prize winners in physiology and medicine including Thomas Hunt Morgan (second from the left). In the front, Drosophila fruit flies and a pair of Drosophila chromosomes: