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yDNA Haplogroup I: Subclade I1

Group Administrator: I1 Team - Email: m253@googlegroups.com

Current balance: $1,250.00

Group General Fund
Type Amount Date Donor Note KitNum Donation Type
Debit $350.00 6/8/2009   WTY N32687 Unknown
Credit $200.00 5/25/2009 Jules van Laar WTY I1-As   Individual
Credit $100.00 5/13/2009 Larry Kea WTTY   Individual
Credit $75.00 5/9/2009 Bo Sundqvist WTTY - Every dollar helps   Individual
Credit $100.00 5/9/2009 O.K. Stuvstad Walk the Y   Individual
Credit $200.00 5/9/2009 Samuel Theil WTTY   Individual
Credit $100.00 5/7/2009 John Ralls For Walk Through The Y   Individual
Credit $150.00 5/7/2009 Jules van Laar Walk the Y I1-As   Individual
Credit $100.00 5/6/2009 James M. Gower for I1   Anonymous
Credit $100.00 5/6/2009 Martin Potter Walk the Y Project   Individual
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Project Background

The I1 subclade of Haplogroup I is estimated to be 15,000 to 20,000 years old and confirmed by the single nucleotide polymorphism, SNP, known as M253. According to the Genographic Project, the founder of the I1 branch lived on the Iberian Peninsula during the Last Glacial Maximum or LGM. 15,000 years is a long time ago though and the descendants of that first I1 have spread across Europe. Their children have formed subpopulations each having its own distinct history. While many I1 members trace their ancestry to Scandinavia, others find their roots in the British Isles, Germany, and beyond.
What has happened to the I tree?
The publication of Underhill 2007 and Karafet 2008 has brought major changes to the I tree. FamilyTreeDNA has a page explaining the changes here.
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. 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 M277 SNP or one of the new M253 subclade SNPs, P109 and P259.
Links and References
Articles


Databases
  • Family Tree DNA's open source y-Chromosome Database: ySearch
  • The Sorenson Family of Companies non-profit Foundation's proprietary database: SMGF Database

E-mail Lists/Forums

Journals and News Letters
  • American Journal of Human Genetics
  • Annals of Human Genetics
  • European Journal of Human Genetics
  • FamilyTreeDNA Newsletter: Facts & Genes
  • FamilyTreeDNA Newsletter: Facts & Genes Archives
  • Genome Research
  • Human Genetics
  • Journal of Genetic Genealogy
  • Society for Molecular Biology

Organizations

Websites about y–chromosome DNA

Websites about History