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DNA Q&A: What Exactly Is a Segment?

A: When we’re talking genetic genealogy, a DNA segment is simply a shared piece of DNA. But of course, our DNA testing companies make that definition a bit more complicated. Each has their own way of determining what qualifies as a shared segment. Sound interesting? We’ll get into the cool science-y stuff momentarily. But first, let’s talk about why you, a genealogist, should care about segments…


Source: Family Tree

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