What exactly do the centiMorgan values for DNA segments mean?
The centiMorgan (cM) values for DNA segments are measurements of how likely the segment is to recombine as it passes from parent to child. Segments with higher cM values have a greater probability of recombining in any one generation. Therefore, when you share DNA segments with larger cM values with a match, your common ancestors are likely to come from generations that are more recent.
