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Archiver > GENEALOGY-DNA > 2005-01 > 1104605681


From: Charles <>
Subject: Re: [DNA] MRCA = 800 AD
Date: Sat, 01 Jan 2005 13:54:46 -0500
References: <122820041713.21292.41D1943200015F3E0000532C2200734748050B989A0E00@comcast.net> <6.0.0.22.0.20050101095420.06778e40@wells.org>
In-Reply-To: <6.0.0.22.0.20050101095420.06778e40@wells.org>


Orin,

One must also remember that some family Y chromosomes seem to mutate
faster than others. Several of us early Genetic Genealogy project admins
have noticed this. For example, in my Kerchner Surname Project I have
several known 5th cousins from prior traditional genealogy research who
are a Genetic Distance of 4 relative to each other at 37 markers, i.e.,
2 each from the Ancestral Haplotype of only 250 years ago. And then in
my Laudenslager Surname Project I have known 9th cousins who only differ
from each other by a Genetic Distance of 2 at 37 markers, i.e., 1 each
from the Ancestral Haplotype. Thus in comparing two male lines which may
trace back to a common male ancestor circa 800 AD, a genetic distance of
6 (for a 37 marker haplotype) is easily possible from what I have seen
with the data in my six DNA projects. But I also think one would have to
have strong supporting traditional evidence linking the two male lines too.

http://www.kerchner.com/success.htm

http://www.kerchner.com/laudendna.htm

Charles Kerchner
(FTDNA Kit 577)
www.geneticgenealogydictionary.com

OrinWells wrote:
> Year end clearance - trying to catch up on some back email.
>
> If in your situation I would be cautious. Especially when I have seen
> 500 year relations with zero mutations. If this trend continued in such
> families I would find little basis for assuming 6 mutations would have
> taken place over the previous 700 years.
>
> Regarding the "rare markers" at DYS390 and DYS391, I would presume this
> is rare only in certain populations. In our study with 294 men tested,
> we have nearly 13% with that combination. Maybe that is rare, but is it
> rare enough to base a presumed relationship on? These tended to
> cluster, as one would expect, in certain families. Two families account
> for 10% of the 13% where every member had the configuration. From your
> study one might get the impression these folks were of French origin.
> Not knowing where the families came from prior to 1066 (or even 1500), I
> guess that is possible.
>
> At 09:13 AM 12/28/2004, wrote:
>
>> The fellow from Normandy, who I will call Jean, and my Sinclair
>> participant match on 19 of 25 markers with some individual marker
>> values being very rare. The motif is DYS390=23, DYS391=11.
>>
>> It is possible that we are seeing what has to be the earliest
>> documented MRCA between two individuals. Since there are so many
>> generations where non - paternity events could have taken place, I am
>> unclear as to whether this is an identical by state or identical by
>> descent situation.

> Orin R. Wells
> Wells Family Research Association
> P. O. Box 5427
> Kent, Washington 98064-5427
> <>
> http://www.wells.org
> Subscribe to the "Wells-L" list on RootsWeb


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