Archives

Using an ahnentafel and the DNArboretum tool

There is a new tool, a chrome add-on called DNArboretum, that will generate an ahnentafel ancestor list from a Family Tree DNA tree or from the old format 23andme tree (not myHeritage).

An ahnentafel is a very clever and condense way to show all your ancestors. When trying to match up with a DNA relative it is particularly useful since you can quickly scan their ahnentafel for places and names in common. Obviously it would be better to automate that comparison but with misspellings and Norwegian names that has not worked well for me. However it might work for you, so click here for my blog post about how to use automation to compare GEDcoms.

MyAhnentafel

This is part of my ahnentafel as generated by DNArboretum from my tree at Family Tree DNA when logged into another account there. I clicked on my great grandmother Maren Wold and it bolded all her ancestors and descendants. Note that my parents are missing because they are marked private.

Sue Griffith of Genealogy Junkie has blogged in detail about how to install and use this tool at
http://www.genealogyjunkie.net/blog/dnarboretum-a-great-free-google-chrome-extension-for-viewing-trees-on-23andme-old-style-trees-and-ftdna

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Organizing DNA results with your Genealogy: WIKItree.com

While I have many spreadsheets that I use to analyze DNA results, what I also want is a field in my genealogy program where I can put simple DNA information like haplogroups, where the person tested, and the GEDmatch id number.

To my delight, the free online one world tree at WIKItree.com has all those features. Plus you can see whom you might have gotten your X DNA from, as well as your Y and mtDNA ancestral lines. Another feature is that a person’s profile page shows the tests of relatives that are related by DNA. Here is my mother’s page:

WikiTreeGretchenSmll
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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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The DNA of eye color: it’s complicated

In high school I learned that blue eyes were a simple recessive gene so two brown-eyed parents could have a blue-eyed child but not vice versa. Recently I discovered that this was wrong. Many genes are involved in eye color and with the subtle variations in eye coloring.

GEDmatch eye color prediction for me

GEDmatch.com eye color prediction for me

So I ran the fun eye color calculator at GEDmatch.com and discovered that it shows many of the SNPs involved in my eye color with the details of what they each do.

I had not realized that blue eyes are caused by the lack of (brown) melanin, so really are no color. Blue happens the same way the color of the sky does: light is bounced around in a way that appears blue according to the wikipedia article on eye color. Maybe that is why my eyes appear greenish when I wear certain green shirts and turquoise when I wear those color shirts.

If the two blue-eyed parents have their lack of eye color melanin caused by different genes then they could have a brown-eyed child. I happen to know a brown-eyed child of green and blue-eyed parents (and she looks just like her Dad so not what you are thinking). This case got me curious about how that could happen. So I googled around and found this wonderful article that explains it: http://genetics.thetech.org/how-blue-eyed-parents-can-have-brown-eyed-children

Here is my attempt to simplify the ghist of that article:

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New features for my tools: color selection and more lines

My tools for showing segments on a chromosome picture now allow you to pick the colors yourself. Here is an example of the ancestor DNA mapper with some very different color choices from the ones the program would use.

Sample Chromosome Map ColorsHow to pick the colors is documented on the page for each tool.

My ancestor mapping tool:
http://blog.kittycooper.com/tools/chromosome-mapper/

My segment mapper, up to 40 relatives
http://blog.kittycooper.com/tools/segment-mapper/

No changes were made to the one chromosome mapper so if you want color choice on that tool as well just let me know.

Another recent enhancement is that the segment mapping tool now allows you to specify as many lines as you like for relatives in your chromosome picture. See an example in my post about four generations of inheritance.