Navigation Links
New World founders small in number

About 14,000 years ago - a few hundred thousand years after our putative modern forebears spread out from Africa - descendants of archaic humans crossed the Bering land bridge from Siberia to North America. Several lines of evidence support this model, but that's where the consensus ends and the details are hotly debated. In a paper published in the premier open-access journal PLoS Biology, Jody Hey now reveals how the sizes of the first New World populations have changed since they were founded. His new approach shows that the New World was colonized by a surprisingly small population with an effective size of only about 70 individuals (those individuals likely to contribute genes to the next generation).

Hey's approach addresses shortcomings in traditional population genetic studies that rely on just one gene and that assume that population sizes have been constant over time. Studying levels of DNA sequence variation at a single genomic region, or loci, can offer insight into the history of that gene, but the stochastic nature of gene evolution means that different genes have different histories. Hey analyzed DNA sequences from nine loci, so that the population genetic history could be found despite variation among genes. He also added an additional parameter to standard models to incorporate changes in the size of the ancestral population and of each founder population through time.

His analysis suggests that only about 70 individuals left their ancestral Asian population (estimated at about 9,000 individuals) to reach America 7,000 to 14,000 years ago. Archaeological evidence places the earliest American inhabitants in the New World at around 14,000 years ago. Though Hey's estimates are more recent, they also indicate a high probability at this time period. With this new approach, researchers will be able to explore this and many other questions to fill in the details of the first American immigration.

Citation: Hey J (2005) On the number
'"/>

Source:Public Library of Science


Page: 1 2

Related biology news :

1. Worlds largest rainforest drying experiment completes first phase
2. World-first Living Donor Islet Cell Transplant A Success; Procedure Offers Promise For Diabetics
3. New Estimates For The Causes Of Child Deaths Worldwide
4. OneWorld Health drug receives Orphan designation from U.S. and European regulatory agencies
5. Measles Deaths Worldwide Drop By Nearly 40% Over Five Years
6. Ancient DNA helps clarify the origins of two extinct New World horse species
7. UN: World in big ecological mess
8. IMF Launches World’s First DNA Database for Myeloma Patients
9. World-first technology enables study of ancient bacteria
10. Biologist Discovers What May Be World’s ‘Pickiest?Mates
11. Ancient trans-Atlantic swarm brought locusts to the New World
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: New World founders small number

(Date:4/17/2014)... Foundation has been named awardee of a three-year ... Defense Spinal Cord Injury Research Program. Gail Forrest, ... double-blinded, controlled, multi-site clinical trial, which will test ... spinal cord injury. Dr. Forrest is assistant director ... Foundation. Two additional sites will participate - the ...
(Date:4/17/2014)... German . ... also provide us with a continuous stream of information about ... sit still in a car the world glides by ... Seemingly without effort, our brain calculates self-motion from this "optic ... a steady gaze during our own movements. Together with biologists ...
(Date:4/17/2014)... release is available in German . ... pay the protection money demanded of him, he can expect ... required, however, as fear of the consequences is enough to ... in parasitic birds, which lay their eggs in other birds, ... the brood parasites take their revenge by destroying the entire ...
Breaking Biology News(10 mins):Kessler Foundation awarded Department of Defense grant for spinal cord injury research 2How vision makes sure that little fish do not get carried away 2How vision makes sure that little fish do not get carried away 3How vision makes sure that little fish do not get carried away 4Fear of the cuckoo mafia 2Fear of the cuckoo mafia 3
... New discoveries by researchers at the University ... a first-ever pharmacological treatment for cocaine addiction. ... to treat people with hypertension and anxiety, has ... from retrieving memories associated with cocaine use in ...
... , STONY BROOK, NY"Trophic Downgrading of Planet Earth," a review ... the journal Science, concludes that the decline of ... is causing substantial changes to Earth,s terrestrial, freshwater, and marine ... from ecosystems "may be humankind,s most pervasive influence on nature." ...
... achieved a pivotal breakthrough in the development of a cable ... possible. Armchair quantum wire (AQW) will be a weave ... over long distances. It will be an ideal replacement for ... 5 percent per 100 miles of transmission, said Rice chemist ...
Cached Biology News:UWM research offers hope for treatment of cocaine addiction 2Loss of top animal predators has massive ecological effects 2Loss of top animal predators has massive ecological effects 3'Amplified' nanotubes may power the future 2'Amplified' nanotubes may power the future 3
(Date:1/15/2014)... 15, 2014 Freeslate, Inc ., ... announced that Lupin Limited, one of India’s top five ... Protégé PharmD System for high throughput solid form ... focused on a wide range of quality, affordable generic ...
(Date:1/14/2014)... Doylestown, PA (PRWEB) January 14, 2014 Date: ... p.m. , Location: Warrington Country Club, 1360 Almshouse Road, Warrington, ... only national nonprofit organization solely dedicated to finding a cure ... those affected worldwide, will host its annual Crystal Ball on ...
(Date:1/14/2014)... a leading provider of strategic communications services to corporations and organizations ... the United States and Europe ... is returning to the firm,s Washington, D.C. ... than two years of service as Associate Commissioner for the Office ...
(Date:1/14/2014)... , Jan. 14, 2014 The largest international ... medicinal plants and therapeutic derivatives thereof has endorsed ... and researchers about the challenges of adulterated herb ... ) The Society for Medicinal ...
Breaking Biology Technology:Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 2Lupin Selects Freeslate’s CM Protégé PharmD System to Accelerate Polymorph Screening for Drug Development 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2Former FDA Associate Commissioner Returns To 3D Communications 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 4World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 5World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 6World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 7World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 8
... , June 17 OncoMed Pharmaceuticals, Inc. and Bayer ... alliance to discover, develop and commercialize novel anti-cancer stem cell therapeutics ... of tumor cells believed to play a significant role in the ... , , ...
... The Netherlands and SEATTLE , ... the development of innovative products for,hemostasis and regenerative medicine, ... CSL Behring for the clinical and commercial supply of,plasma-based ... is a leader in the plasma protein therapeutics industry ...
... Researchers at Rensselaer Polytechnic Institute have developed a ... that measure only billionths of a meter thick. ... works on nearly any surface including silicon wafers, ... manufacturing. Sang-Kee Eah, assistant professor in the ...
Cached Biology Technology:OncoMed Pharmaceuticals and Bayer Schering Pharma Announce Strategic Alliance to Develop Anti-Cancer Stem Cell Therapeutics 2OncoMed Pharmaceuticals and Bayer Schering Pharma Announce Strategic Alliance to Develop Anti-Cancer Stem Cell Therapeutics 3OncoMed Pharmaceuticals and Bayer Schering Pharma Announce Strategic Alliance to Develop Anti-Cancer Stem Cell Therapeutics 4OncoMed Pharmaceuticals and Bayer Schering Pharma Announce Strategic Alliance to Develop Anti-Cancer Stem Cell Therapeutics 5ProFibrix and CSL Behring Enter Into Fibrinogen and Thrombin Supply Agreement 2Researchers develop ultra-simple method for creating nanoscale gold coatings 2
...
Purified Mouse anti-Hu LAT (pY226) Storage Temperature: Refrigerate(2 to 8C)...
...
... Signets Xylene Resistant (X/R) Red System ... X/R Red Activator and X/R Red ... with alkaline phosphatase to produce red ... ,Kit Contains:, , Buffer, 100 ...
Biology Products: