As more Big-Y results are returned we are going to see more cases where the previous genealogical assumptions around STR GD are violated. Here is a new example which show that a 67 marker test based match may not be genealogical.
In this case the new result is 61/67 with A656 and 62/67 with PF740. Historically we would have considered a 62/67 match as being borderline genealogically relevant. Even if this new result tests out as PF740+ we know from Big-Y results that the shared common ancestor appeared ~1600 years ago.
R-Z326 (1270BC)
*FGC18842 (592BC)
**S21728 (302BC)
***A656 (153BC)
****A655
***PF740 (400AD)
****3714003
****A312
Full y-sequence testing is still needed to establish the degree of relationship if you are matching different surnames at the 67 STR marker level.
In this case the new result is 61/67 with A656 and 62/67 with PF740. Historically we would have considered a 62/67 match as being borderline genealogically relevant. Even if this new result tests out as PF740+ we know from Big-Y results that the shared common ancestor appeared ~1600 years ago.
R-Z326 (1270BC)
*FGC18842 (592BC)
**S21728 (302BC)
***A656 (153BC)
****A655
***PF740 (400AD)
****3714003
****A312
Full y-sequence testing is still needed to establish the degree of relationship if you are matching different surnames at the 67 STR marker level.
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