Yes, the type of DNA test we use in the Headley/Hadley DNA Project uses the y-chromosome, which is passed from father to son pretty much unchanged from generation to generation. It is used to show that two people share a common ancestor.
While the special price expired last summer, the testing continues. We've added several new members since my previous posting. Hopefully in a couple of weeks, I'll update our results chart with linked family trees at hadleydna.org.
There is another type of DNA test used for ancestry research that follows the mothers lines (mtDNA). I'm not very familiar with that but there's a ton of information on it at the company who does the DNA testing: familytreedna.com.
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