yDNA Haplogroup I: Subclade I1 (to view all results, set Page Size to 4100)- Background

Background

I1 is estimated to be 4000 to 5000 years old (the now outdated "15,000 -20,000 years ago in Iberia" information was wrong), and confirmed by the single nucleotide polymorphism, SNP, known as M253. While many I1 members trace their ancestry to Scandinavia, others find their roots in the British Isles, Germany, Central Europe, Russia and beyond.
What has happened to the I tree? The publication of Underhill 2007and Karafet 2008 has brought major changes to the I tree. FamilyTreeDNA has a page explaining the changes here. The Genographic Project (Geno 2.0) is set to make the next leap forward and, as of 2013, has uncovered more than a dozen new SNPs in the I1 tree alone. 
How do I know I am I1? Because all men with the M253 y-chromosome SNP share a common ancestor all of their short tandem repeat markers, STRs, can be expected to be in a range around that of their forefather. It is then possible to predict the probability of someone's M253 status based on the frequency of their STR values among known I1s. Haplogroup predictions are done by the software at FTDNA and by Whit Athey's Haplogroup Predictor. (DYS455=8 is a very good predictor).  It is also possible to do the math by hand. This table shows the STR value distribution based on the 454 unique haplotypes from the first panel of markers. You may then look at your prediction by FTDNA, use the Whit's Predictor, and compare the frequencies of your marker results to other I1s. In most cases all of these methods will be in agreement and testing for M253 is unnecessary for both genealogical and anthropological information. If you still have doubts, you may wish to look at Borges' article 'Why SNP' to decide if a SNP test is right for you.
The most likely reason for an I1 to take a SNP test is to check for the  M253 subclade SNPs, DF29, M227, P109, L22, Z58, Z63, Z131. More often than not, it is better for an I1 to order SNP's a la carte, rather than ordering the outdated Deep Clade test. Before ordering SNP's, you might want to ask an administer for advise.

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