A unit of genetic separation used in genetics and biotechnology. If two locations on a chromosome have probability"p" of being separated during recombination in a single generation, then the distance between those locations is pmorgan. In practice, measurements are made in centimorgans, each centimorgan representing a 1% probability. The unit honors the American geneticist Thomas Hunt Morgan (1866-1945), who received the Nobel Prize for Medicine in 1933 for his pioneering work in studying the genetics of the fruit fly Drosophila