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R1b-L1335

  • 2292 members
Administrators
  • Gail Riddell
  • John Harper
  • John Templer Harper
  • JT Harper
Co-Administrators
  • Alasdair Macdonald
  • Alun Davies
  • Kevin Griffin
  • Ross Buchanan

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About us

RESULTS & STATUS

The results of current testing are contained primarily on four reports, that are all accessible from the linked headings below. 


R1b-L1335 Project Reports


Y Classic project chart

Detailed report of all Y STR values for every member in the projected sorted by project subgroup. Check this report for project administrator recommendations on STR and SNP testing. The report comes in multiple pages so as not to be slow, but you can view all of the pages at once if you enter 1000 into “page size.” If you are looking for a particular name or kit number you can do a “Ctrl-F” or “Find” from your internet browser. Many members use the Y Classic Chart to copy/paste (special) data from so they can do their own analyses. Please read the “Analysis and Commentary” (scroll down) for information on the subgroups.

Y Colorized project chart

Detailed report of all Y STR values for every member in the projected sorted by project subgroup. This report has statistics for each STR for each subgroup. This is includes the mode (most common), the minimum and the maximum values. Genetic genealogists often use the modal value as a proxy for the ancestral value for a subclade. This is not always true, but it is oftentimes very helpful to look for an a pattern of unusual values within a clade or subclade. This is called an STR signature and if you can identify a group that you fit into with a shared STR signature that can help your SNP testing be more efficient as the signature may indicate an underlying SNP marked subclade.

Y DNA SNP project report

Detailed report of all actual SNP test results for every member in the project. This report is very useful if you can determine a valid STR signature from the reports mentioned above. If you have other project members that you have close Genetic Distances (on your myFTDNA Y matches webpage) or you have members that match your STR signature you can search through this SNP report and see if your matches have tested for certain SNPs and see what their results are.

Ancestor project map

Global map that will show you the distribution of various project subgroups. You select which subgroup you want to view. You can use this to get an idea of where certain subgroups might be from. Be cautious, though, a point of origin is not necessarily the point with a high frequency of a particular subgroups. Many researchers think higher STR diversity and the presence of brother subclades is more indicative of origins.




R1b-L1335 Descendant Tree

An overview of the early and major branches.






PDF downloadable version of the Tip of the Iceberg Descendant Tree. This file has more resolution for better visibility with zooming and panning.

coming soon

The most comprehensive tree for R-L1335 is the public haplotree at
R-L1335 FTDNA haplotree



TIME TO MOST RECENT COMMON ANCESTOR tMRCA
Estimates are expressed in years AD, for targetted pairs of Big Y-700 men.

Use by looking up the total number of unmatched singletons for both men, preferably from the Private Variants tab for each man, and then finding that number in the rows below Then using the genetic distance at Y111, go to the two columns that match that number First column is the most recent, second the most distant, of the 95% confidence limits in years AD. Remember that not all men will fall within these limits, but most will.

Note the na row can be used for men without Big Y, but mostly this is for men with Big Y-700 results.

Calculations and cautions were given in a report to the R-U106 project members, by Dr Iain McDonald.
https://groups.io/g/R1b-U106/topic/tmrca_estimate_look_up_table/86978532?p=,,,20,0,0,0::recentpostdate/sticky,,,20,2,0,86978532,previd=1637013240637175740,nextid=1634138479404859169&previd=1637013240637175740&nextid=1634138479404859169


http://www.jb.man.ac.uk/~mcdonald/genetics/tmrca-bigy700-targetted.txt



STOCHASTIC VARIABILITY IN NATURAL SYSTEMS

Having a random probability distribution or pattern that may be analysed statistically but may not be predicted precisely.

as calculated by Iain McDonald

 

"two Big Y tests, separated by a common ancestor living 200 years ago, your probability of getting (when added together) a given number of SNPs that differ between the two tests is described by Poisson statistics, roughly as follows:

 

#SNPs                0             1             2             3             4             5             6

Probability         0.8%      4.0%     9.0%      15.0%   18.0%    17.0%    14.0%

cum(at least)    100%    99%       95%       86%       71%        53%       36%

 

#SNPs                 7             8             9             10          11           12

Probability         10.0%    6.0%     3.0%      1.5%     0.7%      0.3%

cum(at least)    22%       12%       6%         3%          1%         0.3%

 

and he concludes            "the mutation rate seems to remain an immutable, fixed number, around 8.2x 10^-10 SNPs per base pair per year. The relatively slow (for us) mutation of the Y chromosome, however, leads to much bigger stochastic variation than most people expect."

 

https://groups.io/g/R1b-U106/message/3977?p=,,,20,0,0,0::Created,,Iain,20,2,0,80781641

 

We can add the 4,5,6 probabilities together and see that half (49%) of us, who are descended from a man living 200 years ago (about 1750) will have an average of 2 or 3 singletons each. Similarly using 2>8 gives 89% of us will have an average of 1, 2, 3 or 4 singletons each. Only about 5% of us will be either side; with none (one may have 1, the other man none), or more than 4 singletons each (average).