This is a reblog of a great article from the blog DNA-explained. Long, but worth the read to help us understand autosomal DNA.
Welcome to the concepts articles. This series presents the concepts of genetic genealogy, not the details. I have written a lot of detailed articles, and I’ve linked to them for those of you who want more. My suggestion would be to read this article once, entirely, all the way through to understand the concepts with continuity of thought, then go back and reread and click through to other articles if you are interested.
All of autosomal genetic genealogy is based on these concepts of inheritance and matching, so if you don’t understand these, you won’t understand your matches, how they work, why, or how to interpret what they do or don’t tell you.
Someone sent me this question about autosomal DNA matching.
“I do not quite understand how the profiles can be identified to an ancestor since that person is not among us to provide DNA material for “testing”…
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