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DNA and Genealogy

Is a DNA profile helpful in doing genealogy? What can it tell you about your ancestors? This is a link to a page "Genetic Genealogy Q&A for Beginners"

You might like to look at this article that points out that your genetic ancestors are fewer than your family tree ancestors: Here's a quote: "After about eight generations back, the number of genetic ancestors only increases linearly with the number of generations, while the number of genealogical ancestors keeps increasing exponentially. Once you go back 20 generations, you have only 1300 or so genetic ancestors despite having over a million genealogical ancestors."