Archive | 2015

Using an ahnentafel and the DNArboretum tool

Sep11

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

Continue reading →

Please upload your ancestry DNA data to a site with a chromosome browser

Sep1

Today I sent the following email to a newly found DNA cousin match at ancestry whose great-grandmother lived right next door to my family in Kristiansand, Norway in the late 1800s. She moved to the U.S.A just a year after they did (1884 and 1885) and lived a block away from where my grandad eventually lived on Ovington Ave in Brooklyn, N.Y.

Monsen Home KristiansandDear cousin,

OK now I REALLY want to see where our DNA matches, because I have a large database (spreadsheets) of where my Dad, my brother and I match various known Norwegian relatives so it is likely that I can figure out from the matching DNA segment(s) where we are related and if it is really the 7th cousin match shown at Ancestry.com on the Eigeland line.

Pretty please either upload to GEDmatch or Family Tree DNA or both.

First you will need to get the raw data from Ancestry.com – here is how:

UPDATE 15-Aug-2018: Roberta Estes has published a step by step on how to do this: https://dna-explained.com/2018/08/15/ancestry-step-by-step-guide-how-to-upload-download-dna-files/ Continue reading →

Help me collect X chromosome data

Aug26

A new approach to problem solving is to appeal to social media. So here is my request to “crowd” collect statistics about X chromosome matches. If you have multiple close family members DNA tested then please help me by filling out this form for each relationship at http://goo.gl/forms/4294xjjhqq

XcollectingI have already put this request on DNA_NEWBIES and facebook so the form is now, hopefully, well tested and I will list some of my preliminary results at the end of this post. I have to give credit to Blaine Bettinger for this data collection idea; he is collecting autosomal statistics this way, see my post about that and the results so far.

Now why did I decide to collect these statistics aside from my own curiosity? To help an adoptee of course.

Continue reading →

Touring the Family Tree DNA lab

Aug24

Some people when visiting Houston might want to go see the butterflies or visit the art museum but not me. On my first day here my choice was to go over to Family Tree DNA and take a tour of their testing laboratory conducted by Bennett Greenspan himself. Sometimes there are benefits to being a well known blogger!

The Tecan machine

Bennett points out the Tecan machine, which adds chemicals to extract the DNA

The lab is remarkable for its use of robotics. Bennett said something to us along the lines of “knowledge workers should be doing knowledge tasks and robots the repetitive tasks. Hard to compete with China any other way.” It was great to see all those automated pipettes. It would have been nice to have those in our science labs way back when.

All of us genealogists who are using DNA testing to solve family mysteries have Bennett Greenspan to thank for starting the personal genome testing revolution in 2000. All because he was a genealogist who wanted to know if he was related to some possible cousins in Argentina and could not find it with the paper trail. He also had time on his hands due to selling his photographic supplies business. Here is the story in an interview he did on youtube: https://www.youtube.com/watch?v=4bq092MQUGQ

Continue reading →

Size Matters for Matching DNA Segments

Aug12

The more large segments you share, the more closely related you are to a DNA match. To learn more about segments, read the blog by one of my favorite DNA writers on the yahoo DNA-NEWBIE list, Jim Bartlett, called Segmentology.org
Brynne Ancestor MapHe explains why you share such large chunks of DNA with your closer relatives by showing how recombination works and how few cross-overs there usually are in a recent post at  http://segmentology.org/2015/05/24/segments-bottom-up/

While the total amount of shared DNA in centimorgans (cMs) is a fine indicator for your closest relatives out to second cousins, farther relationships can be more and more random in the amount of shared DNA. You can consult the charts and numbers at ISOGG here – http://www.isogg.org/wiki/Autosomal_DNA_statistics – to determine those closer relatives.

Continue reading →