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Mapping an Ancestral Couple: a Backwards Use of my Segment Mapper

Sometimes I wonder if the interest in genetic genealogy runs in our DNA. I have found many more new cousins with autosomal testing that are descended from my WOLD line than in any other family. Yes they all had lots of children until recently, but so did the Munsons and the Skjolds.

So I decided to make a picture of the HIR (half identical region) DNA segments that I know come from my great-great-grandparents Jørgen and Anna Wold of Drammen, Norway. To do this I made a CSV file with a list of all the segments that are just from those ancestors. I put the first names of the group of matches in the column that would be the MRCA in the usual style segment map. I have to give credit to my distant DNA cousin (on the AJ side) Israel Pickholtz (he blogs too) for this wonderful idea of making a reverse segment map. Below is my picture of Wold DNA created with my DNA segment mapper tool. Click the image to go to the actual html page which will show the centimorgan values and names when you put your mouse on a colored block.

WoldDNAsmllThe use of two lines is arbitrary; I could have used three or four. The DNA segments shown are not separated into lines for Anna and those for Jorgen. Where that was possible, I had intended to do it with colors, but did not get to it, next version. Knut, OK, Nancy and Aaron are on Anna’s side while Susannah, her mother, and Lester are on Jorgen’s side only.
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In defense of Ancestry.com’s DNA offering

The recent good sales prices got to me, so I broke down and tested my brother with the Ancestry.com DNA test. I had held off testing there, not because of the low opinion of their DNA tools held by serious genetic genealogists, but because my ancestors emigrated to the USA so recently that I doubted whether I would have many useful matches in a database that is 99% American.

So why do the serious genetic genealogists complain? My DNA cousin and blogger Kelly Wheaton  on the DNA-NEWBIE yahoo list described ancestry’s offering as “a dumbed down product on steroids;” which really says it well.

ShipleyAncestryDNAsmllShe went on to say, “What Ancestry.com DNA testing does better than anywhere else for people with a decent sized tree (1,000 people or more), and who are American or Canadian, is make matches for you. If you have a DNA match and a tree match it does the work for you. Although these suggested matches may not be accurate in terms of who the ancestors in common are for two people who have multiple relationships, for most they do a fine job.” I completely agree with her.

By the way, the serious genetic genealogists do not like it because you cannot see where the DNA segment match is and thus triangulate with another cousin to prove that this is the right common ancestor. You have to load the raw data from ancestry to GEDmatch in order to look at the segment overlaps and not all your matches at ancestry will do this. But you have to give Ancestry.com credit for good marketing and for making it easy for folk who are not interested in doing the hard work to prove these relationships.
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How many ancestors do we all really have?

In a post back in May, I discussed how there were not enough people on the earth in about the year 1000 A.D for all the ancestors we theoretically have.

Recently I found a great Utube video via a facebook post that explains the “how many ancestors” problem brilliantly. So here it is:

One can postulate that everyone alive at about 1000 A.D. in Europe, who has descendants, is the ancestor of every European person today. Therefore we are ALL descended from Charlemagne. I have at least 3 documented lines to him, how many do you have? See this page on my family history site for more.

Using my segment mapper for cousin Katy

I finally got Katy’s data uploaded to GEDmatch so that I could compare it to all my other WOLD cousins. Naturally I had to make a spreadsheet of her overlaps, save it as a CSV file, and then run it in my segment mapper tool to get a pretty picture Here it is! Click on the image below to get to the full html page that includes the mouse-overs showing the actual cM size and the base pair boundaries.
KatysWOLDmatches
One thing I find interesting is how large the segments are for us fairly close cousins.
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A Success with my DNA Spreadsheet

The other day I got an email from Katy, a new close cousin match for my Dad at family tree DNA, a 2nd to 4th cousin. I went and looked at where she matched Dad and saw two quite large segments,  34.47 cM and 18.87 cM. So I added those segments to Dad’s master spreadsheet and saw that the smaller one overlapped an 11.9 cM match with a known 3rd cousin on my WOLD line. But he was tested only at 23andme so I could not compare them. However because I am tested at both, as well as Dad, I could use the comparison with me to determine if they matched each other (see my post on alternate triangulation) and yes we all matched. So I wrote Katy back that she looked to be related on my WOLD line and she replied oh yes, my grandmother was a Wold!

My Gg-grandparents Jorgen and Anna Wold from another cousin

My great-great-grandparents Jorgen and Anna Wold

Her grandmother was the granddaughter of my great-great-grandparents whose pictures are shown above. So they are her gg-grandparents too, making us 3rd cousins and my Dad her 2nd cousin once removed. I had received these photos from another 3rd cousin some time ago. My family no longer had those pictures. One delightful thing about finding new 3rd and 4th cousins is that they often have photographs and stories of ancestors that are new to you.

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