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Archiver > GENEALOGY-DNA > 2007-07 > 1184018695


From: "Alister John Marsh" <>
Subject: Re: [DNA] Are 67 marker tests beingadequatelypromoted byProjectAdministrators?
Date: Tue, 10 Jul 2007 10:04:55 +1200
In-Reply-To: <REME20070709150351@alum.mit.edu>


John,

You said..
>>>>>>>
Am I reading this correctly? Each of the three branches has exactly
one person tested to 67 markers?? If so...
......
The one man who has a distinctive allele needs to be joined by at
least one more testee with the same mutation before you can do more
than just hypothesize that this allele distinguishes the branch.
Indeed, even then, you can only ascribe this allele to the part of
the branch descended from the MRCA of the testees who have it.
<<<<<<<

You understand correctly.

You are correct, that we need more tests on each branch to locate the
position of the distinctive mutations. But at least it is something to work
with, having a known slow marker mutation somewhere in a branch of say 600
years separation.

My point was that testing 67 markers is helpful. If more would test 67
markers in this family, we might be able to date each of the distinctive
mutations. Even by only testing single markers, it would be possible to
learn more about these distinctive mutations, and this I intend to do. I am
awaiting results from another key line of this family before planning the
next step.

In my own family, I have 3 distinctive mutations on very slow markers in the
38-67 set. I have tested a distant relative, and have identified that one
mutation is in my line since 1670, and the other two mutations are older
than 1670. I am trying to get a recently located line tested which may
enable us to see if the older two mutations were around in 1560.

These cases are all "work in progress". But my point is, the 38-67 markers
have potential to give valuable information.

John.



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