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From: "Jerry L. Ivey" <>
Subject: RE: [DNA] MRCA = 800 AD
Date: Sat, 1 Jan 2005 14:03:22 -0600


I have a first cousin once removed with whom I have only a 34/37 match.
He has 2 of the changes and I picked up 1 within only 5 transmissions
from our common ancestor (his grandfather and my great-grandfather).

Yet, my uncle (my fathers brother) matches a distant cousin 37/37 with a
common ancestor most likely ~1775.

I still believe that we will someday find that there is a
time-dependence to the mutation rates, i.e. rates within the 20th
century will be greater than in earlier times.

Jerry L Ivey


-----Original Message-----
From: Charles [mailto:]
Sent: Saturday, January 01, 2005 12:55 PM
To:
Subject: Re: [DNA] MRCA = 800 AD

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:
>
> 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.


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