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Thomas Hunt Morgan was an American geneticist known for his pioneering work in the field of genetics, particularly through his experiments with fruit flies (Drosophila melanogaster). He demonstrated that genes are located on chromosomes, providing crucial evidence for the chromosomal theory of inheritance. In 1933, he was awarded the Nobel Prize in Physiology or Medicine for his discoveries related to the role of chromosomes in heredity. Morgan's work laid the foundation for modern genetics and significantly advanced our understanding of genetic linkage and variation.