Always Read the Inflight Magazine

You might discover something like this:

The original paper is at http://tinyurl.com/oks5cgl

Archaeological records show that the first wave of Inuit migration to Greenland entered from Ellesmere Island to the northwest and spread down the west coast to the south, where they encountered Norse settlements. The Inuit settled in the southwest and spread up the east coast to settle, but left the north coast of the island empty. Another group of Inuit migrated from Canada in the 17th century and settled in the north - but as the Norse settlements in Greenland had disappeared by 1450, any European ancestry in this population must have come from the Danish colonisers in 1721 or later. The study showed that not only was it unlikely that European admixture in South Greenlandic populations was as old as the Norse settlements, but also that the admixture in the population of Qaanaaq (North Greenland) took place at the same point in time. 

The study compared the populations of Qaanaaq (North Greenland), Tasiilaq (East Greenland), and settlements in South Greenland. It showed that Qaanaaq is an outgroup - the population of Qaanaaq diverged genetically from those of Tasiilaq and South Greenland before the latter two diverged. This supports the dominant hypothesis that North Greenland was settled in a later Inuit migration from Canada. This hypothesis is also supported by linguistics: the Inuktun (Avanersuaq) language spoken by North Greenlanders belongs to the Inuktitut subfamily, as do the languages spoken by the Inuit in Eastern Canada. Kalaallisut (spoken in West and South Greenland) and Tunumiit Oraasiat (spoken in East Greenland) belong to the Greenlandic subfamily. A competing hypothesis is that North Greenland was settled by migrants from the east of the island - if this were the case, the latest split would be between Tasiilaq and Qaanaaq, making South Greenland the outgroup. 

The study also investigated whether the Inuit had interbred with the earlier Dorset (Tuniit) culture when they met in East Greenland. A DNA sample from the closely related ancient Saqqaq culture was used to represent the Dorset, and the study showed that this sample was no more similar to the samples from Tasiilaq (East Greenland) than to samples from any other Greenlandic population, indicating that there was no Dorset admixture in East Greenland. 

I had very little Internet access in Greenland so I couldn't access the blog, but I will hopefully put the rest of the posts about Greenland up later today.