Y-DNA
Three Y chromosome haplogroups dominate the distribution among the Sami: N1c (formerly N3a), I1 and R1a. The most common haplogroup among the Sami is N1c, with I1 as a close second. Haplogroup R1a in Sami is mostly seen in the Swedish Sami and Kola Sami populations, with a low level among the Finnish Sami. Tambets and colleagues suggested that N1c and R1a probably reached Fennoscandia from eastern Europe, where these haplogroups can be found in high frequencies.
However the two haplogroups have a distinctly different linguistic distribution. R1a1a is common among Eastern Europeans speaking Indo-European languages, while N1c correlates closely with the distribution of the Finno Ugrian languages. For example N1c is common among the Finns, while haplogroup R1a is common among all the neighbours of the Sami. Haplogroup I1 is the most common haplogroup in Sweden, and the Jokkmokk Sami in Sweden have similar structure as among Swedes and Finns for haplogroup I1 and N1c.
Read more about this topic: Population Genetics Of The Sami