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(genetics) a unit of chromosome length, used in genetic mapping, equal to the length of chromosome over which crossing over occurs with 1 per cent frequency
Word Origin
C20: named after Thomas Hunt Morgan (1866–1945), US biologist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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centimorgan in Medicine

centimorgan cen·ti·mor·gan (sěn'tə-môr'gən)
Abbr. cM
A unit of crossover frequency in linkage maps of chromosomes equal to one hundredth of a morgan.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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