| Morgan, 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. |
mor·gan (môr g n)n. 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
[môr′gən]
Etymology: Thomas H. Morgan, American biologist, 1866-1945
a unit of measure used in mapping the relative distances between genes on a chromosome. The measurement uses the total crossover value as the basic unit so that 1 morgan equals 100% crossing over or 1 centimorgan equals 1% recombination. One centimorgan is also equal to one map unit. See also map unit.
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