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Archiver > GENEALOGY-DNA > 2010-02 > 1266648754


From: Gary Felix <>
Subject: Re: [DNA] FTDNA will introduce Family Finder (cM limit)
Date: Fri, 19 Feb 2010 22:52:34 -0800 (PST)
In-Reply-To: <da404fe11002191826n6b00498ex5cfdbd1bb00bea34@mail.gmail.com>


Yes, to say it differently: the effect would be to match more relatives in FTDNA's DB due to the lower threshold of 500 SNP's (http://www.familytreedna.com/faq/answers/17.aspx#607)    While 23andme's threshold is 700 (https://www.23andme.com/you/faqwin/rfcalculation/)

In addition FTDNA will show centimorgans for all of matches that are from 1 to 10+ with SNP info per 'block'.

Gary
Mexico DNA Project Admin.

_______________________________________________________________

--- On Fri, 2/19/10, steven perkins <> wrote:

From: steven perkins <>
Subject: Re: [DNA] FTDNA will introduce Family Finder (cM limit)
To:
Date: Friday, February 19, 2010, 6:26 PM

On Fri, Feb 19, 2010 at 8:27 PM, Gary Felix <> wrote:
> <I would be interested in seeing if FTDNA's Family Finder's 10cM limit
> effectively cuts off <most of these 18th century matches that we see.
> These older single segment matches <are the key to assigning a segment
> to an ancestor and manually separating out segment <ownership in more
> closely related individuals.

Also consider that FTDNA will use a lower number of SNPs than 23andMe
uses, 500 vs 700. So while the "length" may be greater, fewer matches
are needed in that to be considered IBD.

Steven C. Perkins



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