I feel like
tumbling down the rabbit hole. I’m
trying to get a handle on using DNA to find
First hurdle is understanding the terminology. What defines a segment? What’s a Centimorgan; and why are all Centimorgans not the same “length”? SNPs? Phasing?
The good news is that every testing company has basic information about
and its use in Genealogy. They’re very
helpful. The user forums on these sites can be even more helpful.
And there are other great online resources for learning
Angie Bush administers a Google+ community called
Genetic Genealogiy Interest Community.
In August, 2015 she’ll resume doing videos and Google+ Hangouts.
23andme tested my
couple of years ago when they still delivered health information gleaned from
their testing. At that time, it was the health info that prompted me to test.
What’s both interesting and frustrating is that the three testing companies all use different algorithms to analyze the raw data, find matches in their database, and also show you the probable ethnic origins in your
DNA. (According to 23andme, I’m 3%
Neanderthal.) You may find that a person
who is high on the list of matches on one site doesn’t show up as a match on
another site even though their DNA raw data
is on both.
Then there’s GEDmatch which allows you to upload raw data from any of the three testing companies. You can also upload a gedcom file that will be associated with your data. Familytreedna.com also permits you to upload your raw data from Ancestry and 23and me.
I’m on a steep learning curve trying to reconcile the analyses from three sites.
My head is spinning! I still have more questions than answers.