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Archiver > GENEALOGY-DNA > 2010-02 > 1265884823


From: "Alister John Marsh" <>
Subject: Re: [DNA] Puzzled
Date: Thu, 11 Feb 2010 23:40:23 +1300
References: <F12E103E-BEAC-4FF5-AB45-377DA4BCDBE2@gmail.com>
In-Reply-To: <F12E103E-BEAC-4FF5-AB45-377DA4BCDBE2@gmail.com>


Lisa,

If a male has one son and one daughter, and all of his descendants have one
son and one daughter, at each generation there would only be one direct male
line male descendant of the original male.

After 10 generations there would be over 1000 descendants, but only one
direct male line male to carry on the original male's surname. After 20
generations there would be over a million descendants, but only one direct
male line male.

The "percentage" of direct male line males to carry on the surname therefore
shrinks over time. If there is only one direct male line male at each
generation, he is a bit vulnerable if an epidemic, war, or famine should
decimate a population.

In an expanding population, there may be less cases of daughtering out. In a
shrinking population, many lines would daughter out.

If you are thinking of a family descended from a male 10 generations back
who left males down to recent generations, he may not have daughtered out,
it may just be that you are unaware of where his living male line
descendants currently are.

In my family, lots of recent branches have daughtered out, but the family
male line ancestor 10 generations back has many dozens, if not more, direct
male line males living today.

John.



-----Original Message-----
From:
[mailto:] On Behalf Of Wilcox Lisa
Sent: Thursday, February 11, 2010 7:35 PM
To:
Subject: [DNA] Puzzled

Why do lineages daughter out?
How many do? Over what period of time?


Lisa

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