CentiMorgan
FTDNA's Family Finder and 23andMe's Relative Finder and Family Inheritance: Advanced use this term to measure the matching DNA segments.
In genetics, a centiMorgan (abbreviated cM) or map unit (m.u.) is a unit of recombinant frequency for measuring genetic linkage. It is often used to imply distance along a chromosome. The number of base-pairs to which it corresponds varies widely across the genome (different regions of a chromosome have different propensities towards crossover). One centiMorgan corresponds to about 1 million base pairs in humans on average. The centiMorgan is equal to a 1% chance that a marker at one genetic locus on a chromosome will be separated from a marker at a second locus due to crossing over in a single generation.
The centiMorgan was named in honor of geneticist Thomas Hunt Morgan by his student Alfred Henry Sturtevant. Note that the parent unit of the centiMorgan, the Morgan, is rarely used today.
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