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Re: Marker mismatch
Posted by: Robert Stafford (ID *****6330) Date: October 01, 2012 at 00:03:13
In Reply to: Marker mismatch by Linda Rudd of 4702

I can assure that Y-DNA testing works quite well. These are the possibilities:

(1) Bad genealogy. This is quite common, since many published genealogies do not meet current proof standards.

(2) Non-paternal event (NPE). An NPE occurs when a child does not assume the surname of his/her biological father. This may be due to an out-of-wedlock birth, a formal or informal adoption, a widow's remarrying while pregnant, name change, etc.

(3) Sample switch. While this is always possible, it is extremely unlikely to occur at the lab that Ancestry uses. It adopted bar-coding very early Some were reported earlier at another lab. However, since they adopted bar-coding, I have not heard of any cases.

You need to test other members of the family to see if there is a pattern. If an NPE occurred, you may be able to pin down the generation when it occurred by testing different branches.

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