Our thanks to Mike Walsh for the use of his beautiful and extremely useful R1b-L21 Descendant Tree above. It shows in an easy-to-understand graphic the latest known configuration of the L21 phylogenetic tree.
Note: Our Y-DNA Results categories have been reduced to the major branches of DF63 and DF13. We did this because Big Y and other NGS testing is growing the L21 tree exponentially, making creating and maintaining separate categories for every sub-branch, sub-sub-branch and branchlet impractical. See the individual L21 subclades projects for greater subcategory detail.
L21 is a Single Nucleotide Polymorphism that characterizes a major R haplogroup. There are a number of subclades downstream of L21 (see the YCC phylogenetic tree on your "myFTDNA" pages' "Haplotree & SNPs" page or the ISOGG phylogenetic R tree).
What is a SNP or Single Nucleotide Polymorphism? A "SNP" (generally pronounced "SNiP") - Single Nucleotide Polymorphism - represents a change at a single nucleotide (A=adenine, C=cytosine, G=guanine, T=thymine) on the y chromosome. In the case of L21, that change occurred at the position identified by the Reference SNP (RefSNP) ID rs11799226, where we have a change to "G" from the "C" most everyone else has. You can trace our shared ancestry by using the YCC phylogenetic tree on your "myFTDNA" pages' "Haplotree & SNPs" page or the ISOGG phylogenetic R tree. The ancestry of all L21+ men, in terms of SNPs, runs like this:
M207+ . . . M173+ . . . M343+ . . . P25+ . . . P297+ . . . M269+ . . . L23+ . . . L51+ . . . L11+ . . . P312+ . . . L21+
Think of that as a pedigree, with R-M207 as the patriarch and 8th great grandfather, so to speak, of R-L21.
WHO CAN JOIN: Anyone who has received an L21+ result from Family Tree DNA (check the top of your "Haplotree & SNPs" page to be sure). If you tested L21+ with some other company, please let us know by email.
Although anyone with an L21+ result can join, we strongly recommend that a member have the full panoply of Y Haplogroup R SNP testing by means of the Big Y or Geno 2.0 test or other extended deep clade testing through Family Tree DNA.
HOW TO JOIN: First, you MUST have an L21+ result and you must be an FTDNA customer. To join the R L21 and Subclades Project, just go to your "myFTDNA" pages and click on "Join Projects" on the left side of the screen. Next, scroll down to "Y Haplogroup Projects". Click on the "R" under that heading. It has a number next to it, but that number is unimportant (it's the current number of y haplogroup R projects). On the next screen, scroll down until you find "R L21 and Subclades". Click on it and then on the little orange "Join" button in the lower right. That should do it.
Or click on "Join Request" at the top of the screen and follow the instructions.
You can join this project with just 12 y-dna STR markers, but 37, 67, or, better still, 111 markers will be of more help to you and to the R L21 and Subclades Project in figuring out our shared ancestry.
DO NOT JOIN THE R L21 AND SUBCLADES PROJECT UNLESS YOU HAVE AN L21+ TEST RESULT OR ARE RECRUITED FOR L21 OR DEEP CLADE TESTING OR OTHER RESEARCH PURPOSES BY AN R L21 AND SUBCLADES PROJECT ADMINISTRATOR.
A positive test result for an SNP (such as M222, L226, etc.) established as downstream of L21 can be inferred as the equivalent of an L21+ test result.
Project Members: Please check the project web site periodically for announcements, news, and the latest information on pertinent FTDNA sales.
Welcome to the R L21 and Subclades Project! Please read everything on this Background page. It contains important information.
NOTE: All of the administrators of the R L21 and Subclades Project are unpaid volunteers with full time jobs of their own. We don't get any money or other favors for selling dna tests. When we send out a bulk email to project members about a new SNP test or some other type of dna test, we do so simply because we think the members ought to know about it.
If you decide you do not want to receive such emails, follow the instructions below.
To stop receiving bulk emails from the R L21 and Subclades Project:
1. Go to your myFTDNA pages.
2. Click on "My Account" at the top left and then on "Personal Profile".
3. Click on "Account Settings".
4. Click on "Match and Email Settings".
5. Find "Project E-mail Settings" on the right. Click on the "No" button beneath "Subscribe to 'bulk' e-mails sent by my project administrators".
That should do it.