What are the Subclades of Haplogroup I?

The human populations with haplogroup I expanded around 15kya, which coincides with estimates for the TMRCA and divergence of subclades of I.  It is at this time that subclade I1 is thought to populate Fennoscandia (present day countries of Norway, Sweden, and Finland).  The migration likely took place through present day France, Germany and Denmark, though the exact routes are not known with certainty.  Subsequent expansion and migration of an I1 subclade and its subclades populated the British Isles and Iceland.  The Vikings were the likely candidates for the spread of I1 subclades and there are studies that link the Celtic, Anglo-Saxon and Germanic heritages to I1.  The Balkan refuge, representing subclade I2 likely spread northeast into Russia. The populations comprising I2 are tightly linked with Slavs.  The subclade, I2a2, found almost exclusively in Sardinia where it makes up nearly 40% of all haplogroups on this island is also present in France and Iberia and makes these locations the likely source of this unique branch of I. 

The further refinement of Y-chromosome ancestry can be obtained taking the Y-DNA Haplogroup I Subclade test (Version 2).  This panel is based upon a collection of 22 SNPs that identify 21 sub-branches or subclades of Y-chromosome haplogroup I.  

The following phylogenetic tree outlines some of the subclades of I.  Click here to view the detailed Haplogroup I tree.




Description of the panel

The Y-DNA Haplogroup I Subclade Test (Version 2) consists of a panel of 22 SNP markers.  These markers are used to define the 21 different subclades in Haplogroup I.  The location of the SNP, the actual mutation that is detected, and the subclade that they define is listed below for each of the markers in the panel.