The Genetics of the Finns

There is a writing from a Roman Empire historian, from around 100 AD or so, mentioning in the North "the most gentle Finns".
 
Some true information:

Human mitochondrial DNA lineages in Iron-Age Fennoscandia suggest incipient admixture and eastern introduction of farming-related maternal ancestry

https://www.nature.com/articles/s41598-019-51045-8

As a support for the late introduction of farming populations in to Finland we do not see strong affinities of western IAM ( Iron-Age and medieval sites ) to for example the CWC maternal gene pools from Estonia and Lithuania6,12,13,14, suggesting either that the mtDNA gene flow between these two regions has been low or that shared mtDNA variation had dissolved before the Iron-Age in Finland. Alternatively, the CWC expansion may have been largely male-driven as suggested by51. However, we observe a strong Neolithic signal in the Iron-Age mtDNA pool in Eastern Finland, thus rather suggesting a southeastern/eastern arrival route of an agro-pastoralist population into the country. Interestingly, their maternal genetic legacy also corresponded to the contemporary modern Finland, especially in SW. We therefore propose that either there has been east-to-west directed gene flow during the Middle Ages, after the introduction of agricultural haplogroups into the east, or that the late change in SW maternal gene pool may reflect recent immigration from more western/southern sources, such as the migration from Sweden during the Swedish reign in Finland (from 1200s–1809). Iron-Age has evidenced high mobility around the Baltic Sea, as evidenced by the genetic and isotope analyses of human remains from 10th to 12th century in Sigtuna, eastern Sweden.

The ancient mitochondrial genomes analyzed here show a notable pattern opposite to the modern variation: mtDNA types usually associated with the hunter-gatherer communities were significantly more common in the ancient western cluster (Levänluhta, Luistari and Hollola) than in the east (Hiitola, Tuukkala), with the haplogroup U frequency as high as 58.3%. In contrast, the farming-related lineages were observed in particular in the ancient eastern cluster. This pattern of division between the ancient sites, and the contradictions with their respective local modern population frequencies emerged also in formal testing of pairwise ΦST values: the western cluster was closer to the modern NE subpopulation than to the modern SW subpopulation whereas the eastern cluster showed closer affinity with the modern mtDNA variation in southwestern Finland.
 
Razib has always been posting his takes on Finnish ancestry, he has even admitted to being a bit obsessed with Finns in the podcast. Every time its a pretty bad theory. He doesnt seem to take to criticism in the comments either.

I dont want to speculate, but takes on Uralics by R1a carriers seem to often be pretty biased, probably because the same areas are involved.
 

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