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surname, a very old Celtic name. As a type of horse, 1840, named for Justin Morgan (1747-1798), Vermont horse-breeder and music teacher; the breed was developed from a stallion he owned.
morgan mor·gan (môr'gən)
Abbr. M A unit for expressing the relative distance between genes on a chromosome based on the frequency with which the genes cross over; one unit equals a theoretical crossover value of 100 percent between two loci.
Morgan Mor·gan (môr'gən), Thomas Hunt. 1866-1945.
American biologist. He won a 1933 Nobel Prize for establishing the chromosome theory of heredity by his studies of the fruit fly Drosophila.