Inomas Hunt Morgan (1866-1945) is called father of experimental genetics. He was an American scientists, famous for his experimental research with the fruit fly (Drosophila) by which he established the chromosome theory of heredity. He discovered presence of gene over chromosomes, chromosome theory of linkage, chromosome mapping, crossing over, criss-cross inheritance \& mutability of genes. Morgan's work played a key role in establishing the field of genetics. He received the nobel prize for physiology or Medicine in 1933.