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This (hopefully ongoing) thread is basically going to be my attempt, with the aid of Maciamo's maps and data from Eupedia, to pinpoint the location of populations representing the genetic (not phenotypical!) pinnacle of their major racial type.
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Firstly we have the Italics who, relatively simply, belong to the U152 subclade of the R1b haplogroup:
From this map, the highest areas of this subclade can be seen to distinctly peak around the city of Brescia, in Lombardy, which is to be the Italic pinnacle.
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Next we have the (Insular) Celts, who belong to the S145 subclade of the R1b haplogroup. Start with the map of this subclade, noting the areas of darkest shading:
Remove from this the areas showing R1a Y DNA, which indicate areas subjected to Viking raids:
Finally, remove areas showing the I1 haplogroup and the U106 subclade of R1b, indicating Germanic presence from Viking and (but mainly) English settlers:
To gain slightly more accuracy, take from the area that has been narrowed down to so far (central and south-west Ireland) areas where Irish is spoken less:
This leaves you with an area that corresponds to the Dingle Peninsula in County Kerry as the Celtic pinnacle.
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Next we have the Iberians, who belong predominately to the R1b-DF27 haplogroup:
This particular haplogroup, however, has a huge Basque influence, which is to be ignored out of some respect for the Atlanto-Mediterranid phenotype, and so this leaves just Catalonia and Castile-La-Mancha as predominate areas. However, Catalonia has some Germanic influence:
This leaves just Castile-La-Mancha as the Iberian pinnacle.
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Next we have the Dinarics, who belong mainly to the I2a1 haplogroup:
According to Maciamo, around 71% of Bosnian Croats belong to this haplogroup, therefore note the epicentre of this map showing areas of 85%+ Bosnian Croat ethnicity:
This leaves you with an area roughly around the city of Posušje as the Dinaric pinnacle.
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Next we have the Germanics, which is a lot trickier to pinpoint, due to admixture within Scandinavia.
Start with base map of Germanic Y DNA, noting the areas of darkest shading:
Remove from this the areas indicating Celtic Y DNA:
Also remove areas indicating Finnic Y DNA:
Finally, remove areas indicating Hunnic Y DNA:
This leaves you with areas that correspond pretty much only to Frisians, specifically the non-Northern variety, which is to be the Germanic pinnacle.
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Lastly we have the Slavs.
Start with a base map of East European admixture:
Remove areas indicating Finnic Y DNA:
Also remove areas indicating East Asian admixture:
Finally, remove areas indicating Germanic Y DNA:
This leaves you with an area roughly around the city of Mazyr in the Gomel Region of Belarus, which is to be the Slavic pinnacle.
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Hopefully this thread doesn't quickly die out, as I think it'd be interesting to hear feedback about this.
Below is the final map showing the locations of these sub-racial pinnacles:
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