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Archiver > GENEALOGY-DNA > 2003-12 > 1071156912


From: Andrew Bond <>
Subject: Re: [DNA] What is a Double Peak
Date: Thu, 11 Dec 2003 07:35:12 -0800 (PST)
In-Reply-To: <6.0.0.22.0.20031209231601.104ec698@wells.org>


OrinWells <> wrote:
We have one other subject with a double peak on YGATA-A10 where he had a
12,13 and the rest of his family (father, brother, two sons and a nephew)
all had 13. This was not passed on to his sons.
-------------------------------------------------------------------------------------------------------------------------------
Orin,
It could be a duplication of the locus, but you would expect it to be passed down to his sons. It also could be that the 12,13 man is a 47, XYY male. This is not uncommon (~1/1000 in European men). It this case the extra Y chromosome does not usually get passed down. I would expect most XYY men would not be noticed (by DYS testing) because they would have a 12,12 which would look like a 12. If this man is XYY he would also have had a mutation on one of his two Y chromosomes. BTW, XYY men do not have any major problems, physically or mentally.

Andrew Bond



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