If your relationship is within recent generations (2nd cousins or more recent relatives), shared autosomal DNA will almost surely be detected. Testing will also detect many 3rd cousins and about half of your
Here is a link to a letter that Family Tree DNA sent to all its customers last week. Please note that the FBI is mainly using autosomal
Here's a link to a Eupedia website that lists percentages of Y-DNA haplogroups by country as well as by populations and
Here is a link to an easy-to-understand explanation of Y-DNA testing at thoughtco.com.
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