This post doesn’t encapsulate everything about DNA Genealogy but serves to cover some of the basics for people interested in taking a test.
So this is my attempt at explaining DNA Genealogy. These days it all makes sense to me but I remember it was a massive learning curve as I got my head around Haplogroups, Segments, Centimorgans, Genomes etc. I’m still learning new things about it even now and there are definitely a lot more people out there who really delve deep into it, but I will try and explain the basics to help you understand how it works and what you can expect.
There are currently 3 main DNA testing companies out there at the moment, that deal with the genealogy aspect of it. There are more but these 3 are the most well known. Ancestry.com (autosomal test only) 23andme.com (autosomal test only) and FamilytreeDNA.com (autosomal, yDNA (direct paternal) & mtDNA (direct maternal)).
There is a 4th company MyHeritage who have just started DNA testing, but at this point in time I wouldn’t recommend them until they iron out some kinks and get a larger database.
All have their pro’s, con’s and various price differences.
A lot of people also upload their results from these 3 companies to Gedmatch.com which is a free site that allows people to compare tests against others from different companies and also has some pretty good tools to use.