I have just updated the
Y-DNA frequencies for Denmark, Sweden and Norway. The sample sizes are now respectively 613, 1323 and 2826, including the FTDNA projects for each country. I didn't use the data from the Scandinavian DNA Project and the Viking DNA Project as I didn't feel like checking for duplicates. Compared to the older data, the percentage of I1 and R1a have increased in Denmark, while R1b and Q have diminished. In Norway and Sweden I1 decreased while R1b increased.
Apart from one J1 sample in western Norway and one T in Denmark, haplogroups J1 and T seem to be completely absent from Scandinavia.
I have noticed a few interesting new pattern in the distribution of some haplogroups. For a start, haplogroups E1b1b and J2 seem to be completely absent from the southern tips of both Norway and Sweden (as confirmed by the major papers by
Dupuy et al. 2005,
Karlsson et al. 2006 and FTDNA data). Both haplogroups are found in more central regions. Haplogroup E in Sweden and Norway appears to be exclusively E-V13 (whereas at least one E-M123 was found in Denmark).
The almost reverse pattern can be observed for haplogroup G2a, which is is found in southern Sweden and west coast of Norway (roughly between Stavanger and Ålesund). In Scandinavia G2a seems to be exclusively the Indo-European G2a3b1, which
I have linked to the diffusion of R1b since the Bronze Age. Those who tested for deep clades were L42+ (G2a3b1a2a). The other G2a subclades linked to the Neolithic farmers have not been found in Scandinavia. This can mean two things:
1) the Neolithic farmers, such as those identified by
Skoglund et al. 2012 and who were autosomally West Asian, did not belong to G2a like in other Neolithic sites in Europe, but probably more to E-V13.
2) those Neolithic farmers did belong to G2a, but were wiped out by Bronze Age invaders.
It is easy to see how G2ab1a came alongside R1b as it is found mostly where R1b peaks in Scandinavia. The question is how and when did E-V13 and J2 come to Scandinavia. Several possibilities again:
1) E-V13 and/or J2 came during the Neolithic and were pushed inland by Bronze Age invaders from the south.
2) All Neolithic lineages were wiped out, in which case E-V13 an J2 came during the Bronze Age and/or Iron Age. Considering that E-V13 and J2 are found in parts of Norway and Sweden where R1b is the lowest, they could have come during the Corded Ware period after being assimilated by R1a people during the advance through Poland and Germany before reaching Scandinavia.
3) E-V13 and J2 are medieval or post-medieval lineages of German, British, French or other European origin.