Re: When did human races split from one another?


a.manansala@xxxxxxxxx wrote:
lauriecurtispj@xxxxxxxxxxx wrote:
Does anyone know any up to date estimates on when humans split into
separate races? Obviously all humans started out as one race, so at
what dates in history did the human population split into the major
geographic races such as negroids, caucasoids, South East Asian &
pacific islander, north east asian? What was the chronological
sequence in which those major races split from one another and what
were the dates?

There was no split and no chronological sequence, that much is clear.

Physical difference does not add up to a "split". Good example is dogs
who have a very wide range of phenotype far exceeding humans, but
actually much less genetic divergence than the latter.

Dog physical divergence has been aided by artificial breeding which has
not however increased the genetic diversity, but probably decreased it
instead. So dogs although looking very different are probably less
divergent genetically than they would have been without artificial
breeding (over the last 200 years or so).

Darwin talked about these differences at some length in his chapter
about "domestic selection" where he mentions pidgeons, horse and dogs,
amongst other animals. What he did not mention in the same breath , but
might have, is humans themsleves whose physical differences and
anomalies cannot be explained by natural selection at all: the hug and
impractical human breast, skin colour, tallness, shortness, varying
ideas of beauty - these have all been selected by the human eye under
the influence of culturally defined preferences.
Such variations are superficial. Great Danes can still mate with Pugs,
and the resulting dog is still very doggy indeed.



Regards,
Paul Kekai Manansala
Quests of the Dragon and Bird Clan
http://sambali.blogspot.com/

.

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