The percent recombination between two markers indicates the map distance between them: 1% recombination = 1 map unit (m.u.).
In genetic genealogy, a centiMorgan (cM) or map unit (m.u.) is a unit of recombinant frequency which is used to measure genetic distance. It is often used to imply distance along a chromosome, and takes into account how often recombination occurs in a region.
