I had meant to make this map one and a half years ago, but postponed it then forgot. The Gedrosian admixture of the Dodecad's K=12b is quite interesting because it probably represents an ancestral genetic component linked to the propagation of R1b lineages. In all likelihood haplogroup R originated in southern central Asia during the Upper Palaeolithic, where it split into three branches: R1a to the north, the R1b towards Iran and eastern Anatolia, and R2 towards the Hindu Kush. R1b lingered for many millennia around modern Iran and Armenia, before crossing over the Caucasus and bring bronze working to the Pontic-Caspian Steppe. R1b can therefore be seen as a lineage of "Gedrosian" origin.
What is amazing is that its distribution in Europe matches almost exactly that of R1b, although to a reduced proportion of roughly 1 to 5 (or up to 1 to 10 in eastern Spain). This can be explained by the progressive dilution of Gedrosian genes as R1b fathers got children with indigenous women as they moved from the Black Sea region to the Danube basin, then to Germany and ultimately to Western Europe.
Iberia has the lowest ratio of Gedrosian admixture to R1b percentage because it is the furthest from the source (along with Britain and Ireland) and the last part of Europe to be heavily settled by R1b (contrarily to Britain and Ireland). Indeed, the Bronze Age did not reach Iberia before 1800 BCE, and didn't spread to the whole peninsula until 1300 BCE, nearly one millennium after the British Isles. Most of Iberia took much longer to become truly Indo-Europeanised (something I have explained here).
Note that I have had to guess that Bosnians had less than 1% of Gedrosian because they have the lowest percentage of R1b in Europe along with the Finns. There was no Bosnian sample listed, but if anybody knows a Bosnian who joined the Dodecad project that would be of great help to confirm this.
What is amazing is that its distribution in Europe matches almost exactly that of R1b, although to a reduced proportion of roughly 1 to 5 (or up to 1 to 10 in eastern Spain). This can be explained by the progressive dilution of Gedrosian genes as R1b fathers got children with indigenous women as they moved from the Black Sea region to the Danube basin, then to Germany and ultimately to Western Europe.
Iberia has the lowest ratio of Gedrosian admixture to R1b percentage because it is the furthest from the source (along with Britain and Ireland) and the last part of Europe to be heavily settled by R1b (contrarily to Britain and Ireland). Indeed, the Bronze Age did not reach Iberia before 1800 BCE, and didn't spread to the whole peninsula until 1300 BCE, nearly one millennium after the British Isles. Most of Iberia took much longer to become truly Indo-Europeanised (something I have explained here).
Note that I have had to guess that Bosnians had less than 1% of Gedrosian because they have the lowest percentage of R1b in Europe along with the Finns. There was no Bosnian sample listed, but if anybody knows a Bosnian who joined the Dodecad project that would be of great help to confirm this.