Tag Archive | segment mapper

Segment Mapper Tool Improvements: another Wold DNA map

The segment mapper can now make a picture from an unlimited number of people, as long as you specify a color for those above 40. Also colors can be specified for every person. Additionally if you want to use a smaller number of tracks than four, it now will use the extra spacing correctly.

These enhancements all came about because I did not like the way my picture of the DNA inherited from my Wold ancestors in my previous post came out. So here it is again. I added a few more people, made it three tracks, and started playing with the colors. More improvements on the way, like fixing the long key to go side to side.

DNA from my Wold gg-grandparents


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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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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.
One thing I find interesting is how large the segments are for us fairly close cousins.
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Found a 3rd cousin in Norway via DNA!

A Norwegian, who turned out to be a descendant of my gg-grandparents Jørgen Wold and Anna Knutsdatter of the Drammen area, tested his DNA on 23andme and came up a close match (3rd-5th cousin) to my Dad with 35 cM over three segments of matching DNA (0.48% shared). Most matches called 3rd to 5th have been just two segments and have turned out to not be that close but rather to share two ancestors. However Henrik was on GENI.com and an exploration of his tree found that he was descended from Jørgen Wold’s daughter Olava. This is the first time it has been so quick and easy to find a relationship! He is much younger than I am, so two generations further down the tree. Naturally I had to use the new DNAgedcom feature where I could compare him to all my shared profiles and see who else he matched. Here is the plot of his matches with my family and the larger shares (surnames removed for privacy except from my Dad and brother) created with my DNA segment mapper tool:


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My Double 3rd cousin versus my brother and my Aunts as shown with my segment mapper

The results came in for my other maternal Aunt so now there are four of us to compare to my double third cousin and still no match on the X! In order to show the comparisons I used my new nifty chromosome segment mapping tool and also added in a bunch of known 5th and 7th cousins to the diagram.


Click on the diagram to go to the full size html page made from the segment mapper. Note that Shipley Munson is my brother.

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