I never understood why they separate jewish as a different admix. Why they dont just score med/middle eastern instead of many different jewish admix branches...
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Its a sum of parts of shared ancestry and combination of results. Some Turkish have high shared ancestry with native Anatoilians in Greece and will give "Greek" results. Same is true with Baltic and whatever.
Perhaps OP's Russian grandfather is of Caucasian descent in reality? That could explain the MH result
So is Gedmatch accurate or does it depend on the DNA company from which I will transfer my kit?