GENEALOGY-DNA-L Archives

Archiver > GENEALOGY-DNA > 2005-08 > 1123004601


From: Robert Stafford <>
Subject: Re: SMGF [was Re: [DNA] FTDNA Genetic Distance Calculations...]
Date: Tue, 2 Aug 2005 10:43:21 -0700 (PDT)
In-Reply-To: <87.2cc5ff60.3020eb0f@aol.com>


SMFG also treats multicopy markers as genotypes in accordance with ISFG recommendations. This method treats 385ab and others as if they were single markers, i.e., 385 either matches or mismatches, but counts as only one even if 385a and 385b both differ.

However, infinite allele calls can also made by treating each copy as a separate markers.
It sounded as if FTDNA was using the genotype method from some of the earlier posts, but I couldn't tell if it were just for 464 or whether they were using it on some or all two-copy markers.

Bob Stafford

wrote:


It looks like the database search at SMGF uses the infinite allele model.
That is, they screen for matches based on the number of markers which match, not
factoring in whether the mismatches are one or many steps different.

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