Awesome substructure within Czech Corded Ware

This is where the three Czech Corded Ware samples from Olalde et al. 2018 cluster in my Principal Component Analysis (PCA) of ancient West Eurasian genetic variation.

The two individuals belonging to Y-haplogroup R1a look like they might be straight from the Pontic-Caspian (PC) steppe. That’s because they’re sitting right next to an Eneolithic sample from the North Pontic part of the PC steppe, in what is now Ukraine, Eastern Europe. This guy, from Mathieson et al. 2018, also belongs to R1a. And if they’re not totally of steppe origin, then clearly they both only have minor ancestry from outside of the steppe.
On the other hand, the third Czech Corded Ware individual, who belongs to the “Old European” Y-haplogroup I2a2a, actually shows no signs of steppe ancestry, because he clusters with Middle Neolithic Central Europeans. Indeed, I can test all of this with the Global25/nMonte method (see here and here), using the Eneolithic North Pontian and Samara Yamnaya as steppe references.

[1] distance%=3.8801 / distance=0.038801
Corded_Ware_Czech:I7272
Barcin_N 82.6
WHG 17.4
Ukraine_Eneolithic:I6561 0
Yamnaya_Samara 0
[1] distance%=2.4713 / distance=0.024713
Corded_Ware_Czech:I7279
Ukraine_Eneolithic:I6561 63.3
Yamnaya_Samara 24.65
WHG 7.35
Barcin_N 4.7
[1] distance%=2.4089 / distance=0.024089
Corded_Ware_Czech:I7280
Yamnaya_Samara 61.25
Barcin_N 17.7
Ukraine_Eneolithic:I6561 12.9
WHG 8.15

But what does this mean? Well, obviously that the R1a in Corded Ware people is not from the PC steppe!
Nah, I’m just messing around; poking a bit of fun at the dumb trolls online still arguing, against all odds, that the steppe ancestors of the Corded Ware people did not carry R1a. But let’s just move on, shall we, because there’s no longer any doubt that the R1a-M417 subclade of R1a, which encompasses almost 100% of the R1a lineages in the world today, expanded from the PC steppe with the forefathers of the Corded Ware folk. For one, it’s found in the aforementioned Eneolithic North Pontian, and two, in the oldest and most steppe-shifted Corded Ware individuals. So that’s that.
See also…
Late PIE ground zero now obvious; location of PIE homeland still uncertain, but…

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