Shannon, I think you already know the answer - very little, if anything. I have stated before that without the DNA data, the AncestryDNA test is not worth it. If all you want to do is find cousins, you can search Ancestry for any of your ancestral names and find many, many cousins - no DNA test required... In fact when they report 4,000 matches that are based on such flimsy DNA (really IBS - or non-DNA matches) "data", you are actually just fishing for cousins without any DNA link. Again, you don't need to pay for a $99 test to do that (you have to pay a lot more for a subscription, however...) I've only gotten a few good matches at AncestryDNA, and most of them had already tested elsewhere. I have found some cousins with MRCAs that I don't have mapped, but I have not been able to find a good DNA segment for any of them. It is very frustrating, and I spend very little time anymore at AncestryDNA. Jim Bartlett On 12/03/13, Shannon Christmas<shannon.s.christmas@gmail.com> wrote: Hi Jim, Knowing that the correlation between cM and Mbps is minimal, that was my first thought. What can anyone learn from from these kinds of matches if you cannot perform chromosome mapping? Very Respectfully, Shannon On Tue, Dec 3, 2013 at 8:30 PM, Jim Bartlett <[1]jim4bartletts@verizon.net>wrote: > Shannon, > > It's because Ancestry's threshold for a match is 5Mbp. There are areas > where a 5Mbp segment doesn't have 1cM. > > Jim - Sent from my iPhone - FaceTime! > > On Dec 3, 2013, at 8:04 PM, Shannon Christmas < > [2]shannon.s.christmas@gmail.com> wrote: > > > Hello all, > > I have observed a pattern for sometime now with AncestryDNA matches. I > will > > find a common ancestor with an AncestryDNA match and invite the match to > > upload their raw DNA data to GEDmatch.com. After the match has uploaded > > their raw data, they provide me with their kit number so that I can > compare > > their data to mine on GEDmatch. GEDmatch reports that there are no > matching > > DNA segments, even at the 1 cM threshold. > > > > Can someone explain why two individuals matched at AncestryDNA would not > > share even a single 1 cM segment on GEDmatch? > > > > Very Respectfully, > > Shannon > > -- > > Mr. Shannon S. Christmas References 1. mailto:jim4bartletts@verizon.net 2. mailto:shannon.s.christmas@gmail.com