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Archiver > GENEALOGY-DNA > 2010-12 > 1293685627


From: "Ken Nordtvedt" <>
Subject: Re: [DNA] The death of paragroups
Date: Wed, 29 Dec 2010 22:07:21 -0700
References: <8FB365E1-2876-4664-AA70-3CCD4CEBB9CB@vizachero.com><000501cba78a$0850ce70$c2482dae@Ken1> <003b01cba79b$5dbd2f00$19378d00$@dgmweb.net><003101cba7ad$8afe1800$c2482dae@Ken1> <005701cba7ba$60e42070$22ac6150$@dgmweb.net><006301cba7bb$82fddfb0$c2482dae@Ken1><005901cba7ca$2913d8b0$7b3b8a10$@dgmweb.net>


----- Original Message -----
From: "Diana Gale Matthiesen" <>

> How probable is it that
> any of the "useful" SNPs have appeared in multiple sons of the same
> father? Is
> it not *far* more probable that the appearance of most, if not all, known
> useful
> SNPs are separated by many generations?

>>
>> [[A trifucating node in a ytree would be a father having three sons who
>> each
> have
>> surviving lines to the present. You can probably think of an example in
>> your
> extended
>> family of relatives or in your genealogical trees. ]]


Nodes, whether bifurcating, trifurcating, or what, have nothing to do with
whether snps, useful or otherwise, appeared in the multiple sons of the same
father. It is their descending lines which are the important things (and
make the node a node) --- do they reach the present or not. So I don't know
how snps got brought into your reply? As I have said repeatedly over the
months and years, the tree exists with or without the snps; the snps tag the
tree and help us learn about features of the tree.

But now that they have been brought up --- yes, the snps on the branch line
segments between nodes are equally likely to happen anywhere along those
branch line segments.


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