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From: "Diana Gale Matthiesen" <>
Subject: Re: [DNA] Y-DNA tEsting
Date: Sun, 18 May 2008 13:09:33 -0400
References: <bc4.226e4c99.3561a5bf@aol.com>
In-Reply-To: <bc4.226e4c99.3561a5bf@aol.com>


Matches at low levels (12 or 25 markers) can be mere coincidence, especially if
those matches are in other surnames. Yes, you're related, but so far back it's
not genealogically relevant (we're all related if you go back far enough). I
use this table to help give my members some perspective on what levels of
matching mean:
http://dgmweb.net/genealogy/DNA/Corbin/CorbinDNA-results-HgR1b.shtml#Match

I have seen a 12/12 match turn into a 23/25 match, then drop to a 28/37 match.
>From a practical standpoint, I see 37 markers as the useful minimum,
*especially* for haplogroup R1b. You can prove non-relationship with 12, but
I'm not confident of relationship without testing at least 37 markers, not
unless the haplotype and surname are both rare.

Diana


> -----Original Message-----
> From: On Behalf Of
> Sent: Sunday, May 18, 2008 11:31 AM
> To:
> Subject: Re: [DNA] Y-DNA tEsting
>
>
> In a message dated 5/18/2008 9:37:56 A.M. Central Daylight Time,
> writes:
>
>
>
> Mitzi* Bateman <> wrote:
>
> >So lets say you are doing a Smith DNA project. You do the 12
> marker test.
> >When you get your results, there are six exact matches. You
> look at the names
> >and including yourself, there are five Smiths and one Jones. ??
>
>
>
> Dear Beth,
> I apologize to Mitzi and to the list as well for apparently
> not signing my
> question. I'm responsible for the above question, trying to
> understand the
> false positive potential. I'm very new at trying to learn
> what my Wyatt
> family line "knows" now that my male cousin has done the 37
> marker match. There
> are seven in our group, all with exact matches on the first
> 12. Then a glitch
> starts here and there. We ended up with only one exact 37
> marker match.
> The person my cousin matched to actually did the 67 marker,
> but no one else in
> our group did.
>
> Thanks to all who have responded to my questions.
> Laura
>
>

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