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Archiver > GENEALOGY-DNA > 2005-07 > 1121156086


From: "Alister John Marsh" <>
Subject: Re: [DNA] Relevance of SNPs to Genealogical Time Frame
Date: Tue, 12 Jul 2005 20:14:46 +1200
References: <200507120135.j6C1Znne006185@lists5.rootsweb.com> <6.2.1.2.0.20050712002601.01e345a8@mail.blairgenealogy.com>


John,

I don't envisage many 33/37 matches of the same surname would be strictly in
different primary haplogroups, such as R haplogroup, and I haplogroup.
However, SNPs distinguish clads as well as primary haplogroups. STR
convergence across clads within a primary haplogroup may prove to be quite
common.

Commercial clad testing has to date been virtually non existant. So
if you ask for examples, in view of the limited clad testing, you will not
likely find any yet. No current data available, does not mean no cases.

As more clad SNPs are discovered, they will become more useful for the
genealogical time frame, particularly in large but young haplogroups, which
may be prone to convergence of haplotypes between clads. Just because
currently there are limited numbers of strategic SNPs, it does not mean that
in principle SNPs do not have the potential to cost effectively be useful
for the genealogical time frame. I guess we have to wait and see what
pattern develops when SNP tests become more readily available.

John.

----- Original Message -----
From: "John A. Blair" <>
To: <>
Sent: Tuesday, July 12, 2005 5:03 PM
Subject: Re: [DNA] Relevance of SNPs to Genealogical Time Frame


> > Suppose you have two people with the same surname, a 36/37 near-match,
> > and a disagreement on the haplogroup report -- what would you conclude?
>
> Could someone please provide a single case where two people with the same
> surname matched 33 or better on 37 markers or 23 or better on 25 markers,
> both took the SNP test and were reported to be in different haplogroups?
> I've asked this question several times before and have yet to get a reply.
>
> It seems to me that until such a situation arises the question of STR vs
> SNP is mute. STRs pertain to the genealogical time frame while SNPs
pertain
> to the antropoligical time frame.
> John
> -----
> John A. Blair
> Goffstown NH
> http://blairgenealogy.com
> mailto:
> BLAIR DNA Project Coordinator
>
>
>
>
> ==============================
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