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Archiver > GENEALOGY-DNA > 2009-02 > 1235686478


From: "Ken Nordtvedt" <>
Subject: Re: [DNA] Puzzle, resolved? (was: TMRCAs for groups of haplotypes)
Date: Thu, 26 Feb 2009 15:14:38 -0700
References: <49A2D0B4.5070808@ucl.ac.uk><49A5C1C5.20907@ucl.ac.uk><f3f05ce80902251519t2609d247u15af1bb7433ab11c@mail.gmail.com><007401c997a1$2ee75090$6400a8c0@Ken1><f3f05ce80902260014t52d406e9s6ad4148a889c58e6@mail.gmail.com><REME20090226155447@alum.mit.edu><11985d4c0902261408n7083b87u724003d52d8c290c@mail.gmail.com>


----- Original Message -----
From: "Rebekah Canada" <>
To: <>
Sent: Thursday, February 26, 2009 3:08 PM
Subject: Re: [DNA] Puzzle, resolved? (was: TMRCAs for groups of haplotypes)


> Hi,
> The practical answer is that should you find yourself with two people,
> same
> suspected paper trail, who match at 25 markers
>
> /\
> / \
>
> and then you find yourself with a third person who also matches at 25
> markers....
>
> /|\
> / | \
>
> You should celebrate the match and find someone else with the same surname
> to test. Then it is time to upgrade to 67 markers. Why were you working
> with
> 25 markers anyhow? :-)
>
> Regards,
> Rebekah

Whoever invented this case to formulate a question picked a hypothetical set
of parameters. But indeed, why so few markers if you want to be able to
infer something about time which narrows the possibilities by a decent
amount?



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