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Interpreting match -- can brothers be off by one number on one marker?

Replies: 4

Interpreting match -- can brothers be off by one number on one marker?

Posted: 14 Mar 2013 10:40AM GMT
Classification: Query
Edited: 14 Mar 2013 2:14PM GMT
I have a match between my uncle and another man who was born 2 years prior to my uncle and put up for adoption. I believe they are half brothers, sharing the same father. They match on all markers except one: DYS 456 17 (my uncle) DYS 456 16 (possible half bro). Does this one number difference on one marker mean that they can't be brothers? Do they share grandfathers instead?

I'm attaching the comparison chart of the two DNA tests.

Thanks!
Attachments:
SubjectAuthorDate Posted
chitcat 14 Mar 2013 4:40PM GMT 
APTurner 14 Mar 2013 5:54PM GMT 
chitcat 14 Mar 2013 6:29PM GMT 
Shari S. 14 Mar 2013 6:54PM GMT 
APTurner 14 Mar 2013 9:38PM GMT 
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