morgan - Thomas Hunt Morgan was an American geneticist and...

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Thomas Hunt Morgan was an American geneticist and embryologist. Morgan received his PhD from Johns Hopkins University in 1890 and researched embryology during his tenure at Bryn Mawr. Morgan was most famous for his experiments on Drosophila, fruit flies, at Columbia University and was awarded the Nobel Prize in Physiology or Medicine in 1933 for his discoveries that genes are carried on chromosomes and are the mechanical basis of heredity. Morgan chose Drosophila as his study subject because of its ability to produce hundreds of offspring and the fact the fruit fly only has four pairs of chromosomes. Morgan bred his flies at his laboratory and after a year of breading, an single male fly with white eyes insead of the usual red appeared in the population. The white eyed fly is a mutant phenotype, while the common red eyed fly is called a wild type. Morgan then mated his muted male fly with a red-eyed female. All the F1 generation of the fly had red eyes suggesting that wild-type allele is dominant. The classical 3 to 1 ratio showed in
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