GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2004-11 > 1101145408
From: "Ken Nordtvedt" <>
Subject: Re: [DNA] Generation length for FTDNATiP
Date: Mon, 22 Nov 2004 10:43:28 -0700
In my view this is a perfect example of excessive packaging by the labs.
Whereas requiring the customers to do a little thinking and tailoring will
keep this field more objective. The "time" dimension of the plots should be
in generations, letting people convert this to years by whatever anecdotal
or fact-based belief they have about length of generations.
----- Original Message -----
Sent: Monday, November 22, 2004 9:46 AM
Subject: [DNA] Generation length for FTDNATiP
> In a message dated 11/22/04 7:48:17 AM Pacific Standard Time,
> > I especially would like to be able to use a figure other than 25 as the
> > length of generation assumption - although this figure is fairly
standard in the
> > literature. However, Doug is quite correct in saying that an argument
> > be made for 30 or even 35 years between generations.
> FTDNA is indeed using 25 years as the average time between generations
> to birth). This is a number commonly found in the literature for
> archaeological time frames, but it may be too short for more recent
> suggests 35 years per generation, based on his study of French Canadian
> This seems more typical of what I've seen, but the number will vary
> to cultural factors as well as the specific period of history. Of course,
> individual line can deviate from the average -- my father's line is 40
> per generation, which gives me hope that my son may yet marry<g>!
> FTDNA could have calculated the average generation length from their own
> set, but if so, this would be another discrepancy to account for, in
> to the higher mutation rate. I suspect they simply used a convenient
> from the literature.
> If you want to adjust the table for your own "best guess" about generation
> length, you could change the column headings to be proportional. For
> you accept the 35 year number, multiply the column headings by 35/25, or
> so that they would read 140-280-420-560-700-840 years.
> Ann Turner - GENEALOGY-DNA List Administrator
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|Re: [DNA] Generation length for FTDNATiP by "Ken Nordtvedt" <>|