Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




ABOUT US
Genetics suggest global human expansion
by Staff Writers
Hinxton, England (UPI) Oct 30, 2012


disclaimer: image is for illustration purposes only

Scientists using DNA sequencing say they've uncovered a previously unknown period when the human population expanded rapidly in prehistory.

The sequencing of 36 complete Y chromosomes revealed this population explosion occurred 40,000 to 50,000 years ago, between the first expansion of modern humans out of Africa 60,000 to 70,000 ago and the Neolithic expansions of people in several parts of the world starting 10,000 years ago, Britain's Wellcome Trust Sangster Institute reported.

"We have always considered the expansion of humans out of Africa as being the largest population expansion of modern humans, but our research questions this theory," Wei Wei of the Sanger Institute and the West China University of Medical Sciences said.

"Now we've found a second wave of expansion that is much larger in terms of human population growth and occurred over a very short period, somewhere between 40,000 to 50,000 years ago."

One possible theory is that during the original out-of-Africa expansion, humans moved along the coastlines of the world, settling as they went.

Their origins and genetic makeup would make them suited to coastal life, but not to the demands of living inland.

"We think this second, previously unknown population boom, may have occurred as humans adapted to their new environment after the first out-of-Africa expansion," institute researcher Qasim Ayub said.

"It took them tens of thousands of years to adapt to the mountainous, forested surroundings on the inner continents. "However, once their genetic makeup was suited to these new environments, the population increased extremely rapidly as the groups traveled inland and took advantage of the abundance of space and food," Ayub said.

.


Related Links
All About Human Beings and How We Got To Be Here






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





ABOUT US
Lucy and Selam's species climbed trees
Los Angeles CA (SPX) Oct 30, 2012
Australopithecus afarensis (the species of the well-known "Lucy" skeleton) was an upright walking species, but the question of whether it also spent much of its time in trees has been the subject of much debate, partly because a complete set of A. afarensis shoulder blades has never before been available for study. For the first time, Midwestern University Professor David Green and Curator ... read more


ABOUT US
Storm leaves billions in damage across eastern US

Atlantic City bar faces hurricane with a drink

Obama races back to White House as hurricane threatens

Asia's mega-cities badly exposed to superstorms

ABOUT US
Russian chemists land on the island of stability

Head of iPhone software out in Apple shakeup

Safety glass - cut to any shape

Cost-effective titanium forming

ABOUT US
Century-long trend of global ocean warming identified

Global precipitation variability decreased from 1940 to 2009

La Nina Caused Global Sea Level Drop

Uncertainty of future South Pacific Island rainfall explained

ABOUT US
Polar bears seen taking refuge on icebergs

Biologists record increasing amounts of plastic litter in the Arctic deep sea

Opposite Behaviors? Arctic Sea Ice Shrinks, Antarctic Grows

Italian snow levels, glaciers retreating

ABOUT US
Greater effort needed to move local, fresh foods beyond 'privileged' consumers

Minimizing Mining Damage with Manure

Gaps in border controls are related to alien insect invasions in Europe

Black rice and tea in Italy as China shows its green side

ABOUT US
Earthquake shakes buildings in Philippine capital

Storm-battered US battles floods, power cuts

Sandy leaves death, darkness and destruction

Deadly storm floods and blacks out Manhattan

ABOUT US
Senegal foreign, interior ministers lose jobs in reshuffle

G.Bissau's alleged coup mastermind to face military court

Rwanda ex-army chief's refugee status questioned in S.Africa

Making transport a driver for development in Africa

ABOUT US
Genetics suggest global human expansion

'Digital eternity' beckons as death goes high-tech

Primates' brains make visual maps using triangular grids

Lucy and Selam's species climbed trees




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement