A couple of fundamental questions from someone one new to the concept of genealogical DNA. As first step I had a 12 marker Y test completed. The results provided 2 exact matches and 8 with a genetic distance of 1. None of the matches had the same surname as my own, however, so I understand that my relationship with these other gentlemen is quite distant. I would appreciate advice on whether one of the more comprehensive tests would be worthwhile in my instance. Is it possible that 12Y or any of the more extensive tests could help determine which branch of Clan Donald I descend from? Given the geographical location and anecdotal evidence Keppoch (so Clan Ranald) is the most likely . Athol McDonald