Robert Kar
Thu, Jul-19-07, 06:16
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New research proves single origin of humans in Africa
New research published in the journal Nature (19 July) has
proved the = single origin of humans theory by combining
studies of global genetic = variations in humans with skull
measurements across the world. The = research, at the
University of Cambridge and funded by the Biotechnology = and
Biological Sciences Research Council, represents a final blow
for = supporters of a multiple origins of humans theory.
Competing theories on the origins of anatomically modern
humans claim = that either humans originated from a single
point in Africa and migrated = across the world, or different
populations independently evolved from = homo erectus to home
sapiens in different areas.=20
The Cambridge researchers studied genetic diversity of human
populations = around the world and measurements of over 6,000
skulls from across the = globe in academic collections. Their
research knocks down one of the = last arguments in favour of
multiple origins. The new findings show that = a loss in
genetic diversity the further a population is from Africa is =
mirrored by a loss in variation in physical attributes.=20
Lead researcher, Dr Andrea Manica from the University's
Department of = Zoology, explained: "The origin of
anatomically modern humans has been = the focus of much heated
debate. Our genetic research shows the further = modern humans
have migrated from Africa the more genetic diversity has =
been lost within a population.=20
"However, some have used skull data to argue that modern
humans = originated in multiple spots around the world. We
have combined our = genetic data with new measurements of a
large sample of skulls to show = definitively that modern
humans originated from a single area in = Sub-saharan
Africa."=20
The research team found that genetic diversity decreased in
populations = the further away from Africa they were - a
result of 'bottlenecks' or = events that temporarily reduced
populations during human migration. They = then studied an
exceptionally large sample of human skulls. Taking a set = of
measurements across all the skulls the team showed that not
only was = variation highest amongst the sample from south
eastern Africa but that = it did decrease at the same rate as
the genetic data the further the = skull was away from
Africa.=20
To ensure the validity of their single origin evidence the
researchers = attempted to use their data to find non-African
origins for modern = humans. Research Dr Francois Balloux
explains: "To test the alternative = theory for the origin of
modern humans we tried to find an additional, = non-African
origin. We found this just did not work. Our findings show =
that humans originated in a single area in Sub-Saharan
Africa."=20
Source: Biotechnology and Biological Sciences Research Council
http://www.physorg.com/news103983229.html
--=20 Posted by Robert Karl Stonjek
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<DIV><TBODY><TR><B><FONT size=3D5>New research proves single
origin of = humans in=20 Africa</FONT></B></DIV><STRON-
G></STRONG></TD></TR><TR><TD>
<DV><BR><B>New research published in the journal
<I>Nature</I> (19 = July) has=20 proved the single
origin of humans theory by combining studies of global
= genetic=20 variations in humans with skull
measurements across the world. The = research, at=20
the University of Cambridge and funded by the
Biotechnology and = Biological=20 Sciences Research
Council, represents a final blow for supporters of a =
multiple=20 origins of humans
theory.</B></DIV><STRONG></STRONG></TD></TR><TR><TD>
<DVI><BR>Competing theories on the origins of anatomically
modern humans = claim=20 that either humans originated
from a single point in Africa and migrated = across=20
the world, or different populations independently
evolved from homo = erectus to=20 home sapiens in
different areas. <BR><BR>The Cambridge researchers =
studied=20 genetic diversity of human populations
around the world and measurements = of over=20 6,000
skulls from across the globe in academic collections.
Their = research=20 knocks down one of the last
arguments in favour of multiple origins. The = new=20
findings show that a loss in genetic diversity the
further a population = is from=20 Africa is mirrored by
a loss in variation in physical attributes. =
<BR><BR>Lead=20 researcher, Dr Andrea Manica from the
University's Department of = Zoology,=20 explained:
"The origin of anatomically modern humans has been the
focus = of much=20 heated debate. Our genetic research
shows the further modern humans have =
migrated from Africa the more genetic diversity has been lost
within a=20 population. <BR><BR>"However, some have used skull
data to argue that = modern=20 humans originated in multiple
spots around the world. We have combined = our=20 genetic data
with new measurements of a large sample of skulls to show=20
definitively that modern humans originated from a single area
in = Sub-saharan=20 Africa." <BR><BR>The research team found
that genetic diversity = decreased in=20 populations the
further away from Africa they were - a result of =
'bottlenecks'=20 or events that temporarily reduced
populations during human migration. = They then=20 studied an
exceptionally large sample of human skulls. Taking a set of=20
measurements across all the skulls the team showed that not
only was = variation=20 highest amongst the sample from south
eastern Africa but that it did = decrease at=20 the same rate
as the genetic data the further the skull was away from =
Africa.=20 <BR><BR>To ensure the validity of their single
origin evidence the = researchers=20 attempted to use their
data to find non-African origins for modern = humans.=20
Research Dr Francois Balloux explains: "To test the
alternative theory = for the=20 origin of modern humans we
tried to find an additional, non-African = origin. We=20 found
this just did not work. Our findings show that humans
originated = in a=20 single area in Sub-Saharan Africa."
<BR><BR>Source: Biotechnology and = Biological=20 Sciences
Research Council</DIV>
<DVII><A=20 href=3D"http://www.physorg.com/news103983229.htm-
l">http://www.physorg.com=
/news103983229.html</A></DIV>
<DVIII> </DIV>
<DIX><BR>-- <BR>Posted by<BR>Robert Karl=20
Stonjek</TD></TR></TBODY></TABLE></DIV></BODY></HTML>
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text/plain; charset="iso-8859-1" Content-Transfer-Encoding:
quoted-printable
New research proves single origin of humans in Africa
New research published in the journal Nature (19 July) has
proved the = single origin of humans theory by combining
studies of global genetic = variations in humans with skull
measurements across the world. The = research, at the
University of Cambridge and funded by the Biotechnology = and
Biological Sciences Research Council, represents a final blow
for = supporters of a multiple origins of humans theory.
Competing theories on the origins of anatomically modern
humans claim = that either humans originated from a single
point in Africa and migrated = across the world, or different
populations independently evolved from = homo erectus to home
sapiens in different areas.=20
The Cambridge researchers studied genetic diversity of human
populations = around the world and measurements of over 6,000
skulls from across the = globe in academic collections. Their
research knocks down one of the = last arguments in favour of
multiple origins. The new findings show that = a loss in
genetic diversity the further a population is from Africa is =
mirrored by a loss in variation in physical attributes.=20
Lead researcher, Dr Andrea Manica from the University's
Department of = Zoology, explained: "The origin of
anatomically modern humans has been = the focus of much heated
debate. Our genetic research shows the further = modern humans
have migrated from Africa the more genetic diversity has =
been lost within a population.=20
"However, some have used skull data to argue that modern
humans = originated in multiple spots around the world. We
have combined our = genetic data with new measurements of a
large sample of skulls to show = definitively that modern
humans originated from a single area in = Sub-saharan
Africa."=20
The research team found that genetic diversity decreased in
populations = the further away from Africa they were - a
result of 'bottlenecks' or = events that temporarily reduced
populations during human migration. They = then studied an
exceptionally large sample of human skulls. Taking a set = of
measurements across all the skulls the team showed that not
only was = variation highest amongst the sample from south
eastern Africa but that = it did decrease at the same rate as
the genetic data the further the = skull was away from
Africa.=20
To ensure the validity of their single origin evidence the
researchers = attempted to use their data to find non-African
origins for modern = humans. Research Dr Francois Balloux
explains: "To test the alternative = theory for the origin of
modern humans we tried to find an additional, = non-African
origin. We found this just did not work. Our findings show =
that humans originated in a single area in Sub-Saharan
Africa."=20
Source: Biotechnology and Biological Sciences Research Council
http://www.physorg.com/news103983229.html
--=20 Posted by Robert Karl Stonjek
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD> <META http-equiv=3DContent-Type
content=3D"text/html; = charset=3Diso-8859-1"> <META
content=3D"MSHTML 6.00.3790.1218" name=3DGENERATOR>
<STYLE></STYLE> </HEAD> <BODY>
<DIV><TBODY><TR><B><FONT size=3D5>New research proves single
origin of = humans in=20 Africa</FONT></B></DIV><STRON-
G></STRONG></TD></TR><TR><TD>
<DV><BR><B>New research published in the journal
<I>Nature</I> (19 = July) has=20 proved the single
origin of humans theory by combining studies of global
= genetic=20 variations in humans with skull
measurements across the world. The = research, at=20
the University of Cambridge and funded by the
Biotechnology and = Biological=20 Sciences Research
Council, represents a final blow for supporters of a =
multiple=20 origins of humans
theory.</B></DIV><STRONG></STRONG></TD></TR><TR><TD>
<DVI><BR>Competing theories on the origins of anatomically
modern humans = claim=20 that either humans originated
from a single point in Africa and migrated = across=20
the world, or different populations independently
evolved from homo = erectus to=20 home sapiens in
different areas. <BR><BR>The Cambridge researchers =
studied=20 genetic diversity of human populations
around the world and measurements = of over=20 6,000
skulls from across the globe in academic collections.
Their = research=20 knocks down one of the last
arguments in favour of multiple origins. The = new=20
findings show that a loss in genetic diversity the
further a population = is from=20 Africa is mirrored by
a loss in variation in physical attributes. =
<BR><BR>Lead=20 researcher, Dr Andrea Manica from the
University's Department of = Zoology,=20 explained:
"The origin of anatomically modern humans has been the
focus = of much=20 heated debate. Our genetic research
shows the further modern humans have =
migrated from Africa the more genetic diversity has been lost
within a=20 population. <BR><BR>"However, some have used skull
data to argue that = modern=20 humans originated in multiple
spots around the world. We have combined = our=20 genetic data
with new measurements of a large sample of skulls to show=20
definitively that modern humans originated from a single area
in = Sub-saharan=20 Africa." <BR><BR>The research team found
that genetic diversity = decreased in=20 populations the
further away from Africa they were - a result of =
'bottlenecks'=20 or events that temporarily reduced
populations during human migration. = They then=20 studied an
exceptionally large sample of human skulls. Taking a set of=20
measurements across all the skulls the team showed that not
only was = variation=20 highest amongst the sample from south
eastern Africa but that it did = decrease at=20 the same rate
as the genetic data the further the skull was away from =
Africa.=20 <BR><BR>To ensure the validity of their single
origin evidence the = researchers=20 attempted to use their
data to find non-African origins for modern = humans.=20
Research Dr Francois Balloux explains: "To test the
alternative theory = for the=20 origin of modern humans we
tried to find an additional, non-African = origin. We=20 found
this just did not work. Our findings show that humans
originated = in a=20 single area in Sub-Saharan Africa."
<BR><BR>Source: Biotechnology and = Biological=20 Sciences
Research Council</DIV>
<DVII><A=20 href=3D"http://www.physorg.com/news103983229.htm-
l">http://www.physorg.com=
/news103983229.html</A></DIV>
<DVIII> </DIV>
<DIX><BR>-- <BR>Posted by<BR>Robert Karl=20
Stonjek</TD></TR></TBODY></TABLE></DIV></BODY></HTML>
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