Clusterings are bad with both ydna and adna, for different reasons.
YDNA clades are solid though.
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Any subgroup of one ethnicity is somewhat different from another, what are you talking about?
Btw, the PLOS One paper I talked about earlier, found no significant differences between Romanians and Moldovans. But also no significant differences between Romanians and Moldovans (grouped together) and Balkanites, and no significant difference between Moldovans and East Slavs living nearby Moldova :D
All these local differences are small, whether some like it or not.
Of course, that's the meaning of patrilineal ancestry. It can actually point to an European male ancestor.
adna won't necessarily be able to do that. adna only quantifies the allele distribution in a population. Similar allele frequencies can result without crossing ancestry lines.