GENEALOGY-DNA-L Archives

From: Vincent Vizachero <>
Subject: Re: [DNA] FTDNA backbone test in
Date: Sun, 4 Mar 2007 11:26:07 -0600
References: <000001c75c24$60f75b30$6402a8c0@SUSAN01>
In-Reply-To: <000001c75c24$60f75b30$6402a8c0@SUSAN01>

On Mar 1, 2007, at 11:09 AM, Sue J wrote:

> I just received the free backbone SNP test on my husband's lines.
> FTDNA only states that he is now R1b1 and +P25. That does not say
> much so I guess the next order of business would be to do the Deep SNP
> test. From fast reading on Google, concerning P25, that alone does
> not signify much of anything and should not be used alone as any kind
> of identifier.

The most severe problem with P25 is that it has been observed to
occasionally be absent in people who are, in fact, R1b1c. It is this
absence which is an "unreliable indicator".

Generally speaking, you are safe to conclude that P25+ means you are
R1b1c. Unless your STR haplotype suggests some question about your
assignment in haplogroup R1b1, I see no reason to worry.

In any event, you would probably get more bang for the buck with an
STR upgrade since relatively few people receive a subclade assignment
from FTDNA's DeepSNP-R1b test.

Vince

This thread:

• [DNA] FTDNA backbone test in by "Sue J" <>

  • Re: [DNA] FTDNA backbone test in by Vincent Vizachero <>

    • Re: [DNA] FTDNA backbone test in by "Lawrence Mayka" <>
  • Re: [DNA] FTDNA backbone test in by "Earl Beaty" <>