I haven't checked, but I wouldn't expect the mutual matches to have the same segment. I mean, the probability of that would have to be miniscule. Diana > From: Jim Bartlett > Sent: Thursday, February 16, 2012 8:23 AM > > Do the matches have the same large segment on the same Chr? I was > trying to triangulate for an adoptee, based on matching ancestors of > of different atMatches - but it turned out the large segment was > usually different, meaning they didn't really match on atDNA. >

Diana - Here are some numbers from my only qualifying case: Matches in common btw my 2nd cousin and me. As of 2/10/12 (with a new one just added) we now have 4 matches in common. (Plus my brother, but we'll leave him out of this for the moment) Note that these 4 shared matches represent 2.3% of my 171 matches and 5% of my 2nd cousin's 80 matches. Match #1 (2nd-4th cousin) I share with Match #1 47cM total, 20cM longest, and that 20cM longest segment is shared with my 2nd cousin My 2nd cousin shares with Match #1 50cM, and the same 20cM longest segment we share in common Match #2 (3rd-5th cousin) I share with Match #2 39cM total, 18cM longest, and the segment we share in common is 9cM My 2nd cousin shares with Match #2 27cM, 11cM longest, and the shared segment is 11cM in his case Note that my 2nd cousin's match with #2 is only (5th - Remote) Match #3 (5th - Remote) I share with Match #3 36cM total, 9cM longest, and that 9cM segment is shared in common My 2nd cousin shares with Match #3 37cM and 10cM longest, and that 10cM is on our shared segment Match #4 (5th-Remote) I share with Match #4 23cM total, 8cM longest My 2nd cousin shares 24cM and 9cM longest We don't have a shared-in-common segment at any level down to 1cM But note that at the >1cM level, my 2nd cousins shares common segments with Match #4 and #1 that *appear* to be identical (same stop/end points and 2.4cM) plus an overlapping segment in that same territory with Match #3 of 2.75cM. Note also that Match#2's sibling is also a match to me, but not to my 2nd cousin And on the subject of variability in amount of DNA shared: My brother shares 397cM total, 69cM longest with our 2nd cousin I share only 274cM total and 49cM longest with him. On Thu, Feb 16, 2012 at 9:49 AM, Diana Gale Matthiesen <[email protected]>wrote: > I haven't checked, but I wouldn't expect the mutual matches to have > the same segment. I mean, the probability of that would have to be > miniscule. > > Diana > > > > From: Jim Bartlett > > Sent: Thursday, February 16, 2012 8:23 AM > > > > Do the matches have the same large segment on the same Chr? I was > > trying to triangulate for an adoptee, based on matching ancestors of > > of different atMatches - but it turned out the large segment was > > usually different, meaning they didn't really match on atDNA. > > > > > > > ______________________________ > For answers to Frequently Asked Questions about mailing lists, please see: > http://dgmweb.net/MailingListFAQs.html > > > ------------------------------- > To unsubscribe from the list, please send an email to > [email protected] with the word 'unsubscribe' without > the quotes in the subject and the body of the message >