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Archiver > GENEALOGY-DNA > 2010-03 > 1268873589


From: (John Chandler)
Subject: Re: [DNA] OT How many races are there?
Date: Wed, 17 Mar 2010 20:53:09 -0400
References: <4234a.6a12e693.38d2b71c@aol.com><BLU126-DS1116FCD0C524B9A8699569922C0@phx.gbl><FD550D35-E1A4-4B9E-B994-C97C9736DF91@vizachero.com>
In-Reply-To: <FD550D35-E1A4-4B9E-B994-C97C9736DF91@vizachero.com> (messagefrom Vincent Vizachero on Wed, 17 Mar 2010 20:20:37 -0400)


Vince wrote:

> Every cluster is a subcluster of something else. And vice-versa.

I think this is a good time to introduce an analogy. Consider islands
and continents. It is purely arbitrary to consider Greenland an
island and Antarctica a continent, and purely whacky to consider
Europe as a separate continent from Asia, but not India. Chunks of
land come in all sizes and all degrees of separation from other chunks
of land, and in fact the chunks shift around on time scales of
millions of years. Similarly, genetic clusters come in all sizes and
degrees of separation and can change over time.

John Chandler


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