I am beginning the process of forming triangulation groups, and I wonder: what do people do with segments on which there are no matches?
I found such a segment already just on the first chromosome I have examined. There is a region with no matches over the threshold on any of FTDNA, MyHeritage, or GEDmatch.
I can think of a couple of reasons: * going back many, many generations and following this segment through my ancestors, it just so happened by chance that all other descendants had this segment excised at some point through recombination (or at least, all descendants that tested DNA at these places) * a mutation happened recently, close enough to another mutation to cause otherwise matching segments to be flagged as non-matches.
Is one of these the more likely explanation?
Should I view short matching segments in such a region as more reliable, i.e., more likely to be IBD, say because it is a personal "anti-pileup region"?