How accurate is Ancestral DNA Testing?
Right now there are three kinds of tests available, 1. Y DNA, which tracks your father to father (patrilineal tribal ancestry). To get these results, your father, brother or patrilineal cousin/ uncle would have to be tested, since women do not carry the y chromosome. On the 67 str with subclade snp matches, it is quite accurate (over 95% probabililty you shared an ancestor in the last 10 generations) with people who match. However, in some cases you may not find a match at this level yet, since the database is still building out. In such cases, you may have to make do with knowing the ancestral population rather than the names of individuals who shared an ancestor in the last 10 generations. On the other hand, sometimes, you can get two or more matches from two or more lineages (5% probability). These false positives are due to convergence. In such cases you may have to wait for new snp tests/ greater str resolution to determine which line is truly yours.
