Most Recent Common Ancestor

Genetic Distances and Distance to Most Recent Common Ancestor (MRCA) Chart

The following charts show the estimated distances between each member in the group.  Compared by the number of markers tested, the distances between their genetic markers are displayed in the first chart, the distance to their most common ancestor is shown in the second chart.  Distances for the most recent common ancestor is given in generations.  These estimated distances were generated using Dean McGee’s “Y DNA Tool” and are based on the following;

– Infinite allele mutation model is used
– Average mutation rate varies: 0.0023 to 0.0023
rates derived by Doug McDonald from the Sorenson database
– Values on the diagonal indicate number of markers tested
– Probability is 50% that the TMRCA is no longer than indicated
– Average generation: 25 years

Additional notes;

The ID column recorded as “Modal” is the computer generated value given to each marker based on the value of the group members within those markers.  It is the “baseline value”.

To find the distance between any two kits, locate the first kit number in the left hand column (going down) and note the “row” it is on.  Next, locate the second kit number across the top row and note the “column” it is on.  Simply follow the “row and column” to their intersecting point.  That will give you the number of generations between those 2 specific kits.

For example, in the 12 marker results kit # 11775 is located in row 36 down the left side of the chart.  To compare the distance to kit #4V729, I locate kit #4V729 across the top in column N.  I follow both row 36 and column N until they intersect and find a distance of 89 generations between the two kits.

Colla Uais & Niall of the Nine Hostages have been included as a point of interest only, based on project members with results matching their known markers.

Please click on the Images to display the full sized charts

12 Markers

All 73 “Y” project members

Genetic Distance

Distance to Most Recent Common Ancestor

25 Markers

We have 60 members tested to this number of markers.

Genetic Distance

Distance to Most Recent Common Ancestor

37 Markers

We have 34 members who have tested at this number of markers, with 33 results received.

Genetic Distance

Distance to Most Recent Common Ancestor

67 Markers

At this time we have 11 members with 67 marker results.  Due to the smaller chart sizes, the full sized charts are displayed below.

Displaying all members tested for 67 markers

Distance to Most Recent Common Ancestor

7 thoughts on “Most Recent Common Ancestor

  1. I’m confused – If you follow your own line across to yourself, shouldn’t the generation difference be zero instead of 12 or 25. Never mind that – it’s in the footnote.

    Also, I tried to match myself to Eddie, but my kit (15046) is only on the 25 marker chart, not the 12 marker chart and Eddie’s was on the 12 marker chart and 37 market chart, but not 25 (13008).
    We have 1 marker different in 12 & 25, and connect 5 generations back.

  2. Paul, as you saw in the footnote, the 12 or 25 when comparing your kit to your kit denotes the markers tested. I’ll have to check on the missing data. I copied the markers into the “Y” DNA tool and the results are generated from there. I’ll check it out as soon as I get home from work this afternoon. On another note, I’m delighted that you are checking out the tools on the site!

  3. Hi Cathy, many thanks for your good work on this! I’m trying to find the father of my ancestor, George Manly, b. 1824 in Talaton, Devonshire, England. There is a paper trail back this far. From DNA I’ve noticed the haplotype similarity to Georgius Maule (Kit #14125). It differs by “1” (mine=R1b1a2a1a1b3c1; #14125=R1b1a2a1a1b3c). This is pretty surprising. So I was delighted with your “genetic distance” and “time to MRCA” charts. If I am doing it right, the 37 marker chart shows 20 generations between the two kits (mine is #181005) to MRCA. That’s the intersection between AK and 12. But the 12 marker chart shows only 7! (BO and 18). The 37 and 25 marker charts seem consistent on the “time”: AT and 15 on the 25 marker chart yields 190 (time), which seems short, but is consistent with the 37 marker, which yields 188. (I assume the more markers, the more accurate.) But that is still only 200 years. 2011-200=1811, but I can trace George Manly back to 1624 through written records which is 185 years further back. The DNA is fascinating, but I’d welcome help interpreting it! Thanks, Jim

  4. Jim, in looking at the charts, I see I managed to generate some in years, others in generations, a problem I will have to correct. Sorry.

    Looking at the charts and using the standard 25 years per generation, your 12 marker distance = 245 yrs, 25 markers = 13 generations or 325 years and the 37 markers = 20 generations or 500 years. If you consider the differing opinions on the average mutation rates, I’d go with a median/average of about 355 years back to that common ancestor or about 1655 as a target. Think you are on target with George Manley of 1624 and a connection to Georgius Maule’s descendants of the next 2 generations. There is a link to the Maule site on that member’s page and I’m sure Jim would be delighted to help you look through the lines to see what you can find.

    I’m still certain that there IS a connection between these 2 surnames back in the 1600s. You may just be the “proof in that pudding”!

  5. Many thanks. This helps a lot. I’ll go back and make sure I’m using the charts correctly. I’ll also head over to Jim’s (Maule’s) site. There is a lot of good information there too. The dates would line up with Georgius’ son, Thomas, as a possible forebearer, but there is nothing in the written record that I’ve been able to find.

  6. Hi Cathy, I’m looking at your May 8th posting above but I can’t replicate it. I just went to the 37 markers mrca april spreadsheet found the intersection point between 14125 (Maule) and 181005 (mine, Manley) and saw 188, looked at the legend and it is in generations! (25×188=4,700 years). Help! Also, the color codes don’t suggest a close connection. I’m looking for the Georgius (or Thomas) Maule connection in, say, 1590, or a bit over 400 years ago. Jim Maule has thought we are genetically linked, but with a much more remote MRCA. Your May posting was encouraging, but I can’t replicate it using McGee’s calculator (which you also used) now now with the spreadsheets. Help!

    Also, in regard to the Maule/Manley connection, shouldn’t the genetic distance and TMRCA be about the same? Jim Maule traces his ancestry back to Georgius and I can trace mine back to George Manly (b.1624) who is about a generation younger than Georgius (maybe early 40’s in 1590 or his son Thomas in his late teens then.) That should make Jim Maule’s and my MRCA not much further back than our genetic distance in years, right? Ah, mysteries!

    I see some pending discussion is no longer pending, nor here. Feel free to email me if that is better.

    Jim Manley of Claremont, CA

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