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:4/23/2014)... Angeles, London (April 23, 2014). "I think one can argue ... pathwayas well as doing everything else that we canthen we ... Tom Wigley, one of the world,s foremost climate researchers, in ... , published by SAGE. Refusing to take significant action on ... eventually be needed to address the problem, Wigley explains in ...
(Date:4/22/2014)... 2014 Scientists from the Florida campus of The ... that plays a critical but previously unknown role in ... showed a novel role for a protein known as ... eLife , a publisher supported by the Howard ... Wellcome Trust. , "This is a critical building block ...
(Date:4/22/2014)... have presented Beaumont Health System with prestigious, competitive ... both athletic and nonathletic injuries. , The ... $40,000 grant to fund stem cell-based research that ... a ruptured knee anterior cruciate ligament, or ACL. ... anterior cruciate ligament injury is the over-stretching or ...
Breaking Biology News(10 mins):Is nuclear power the only way to avoid geoengineering? 2Scientists identify critical new protein complex involved in learning and memory 2Beaumont awarded grants to study sports-related injury treatment, improve recovery 2
... long known that the social insects in the ... unusual mechanism for sex determination: Unfertilized eggs develop ... the development of an unfertilized egg into an ... , One mystery has been the origin of ...
... Hospital & Research Center at Oakland (CHRCO) have published a ... cells die in patients with Alzheimer's Disease. This discovery is ... slow, prevent and eventually cure a disease that affects an ... in the February 28th issue of the Proceedings of the ...
... discovered a cluster of 45 genes coding for ... a major cause of hospital-acquired infections worldwide. ... PLoS Genetics. , "We expected to find resistance ... the Structural and Genomic Information Laboratory at France's ...
Cached Biology News:Researchers now able to look deep into heart to view triggers of a heart's beat 2Researchers now able to look deep into heart to view triggers of a heart's beat 3Rice University researchers create 'nanorice' 2Supersized 'island' of resistance genes discovered in an infectious bacterium 2
(Date:1/14/2014)... 14, 2014 Histogen, Inc., a regenerative ... cells grown under simulated embryonic conditions, today announced that ... Suneva Medical, Inc. for physician-dispensed aesthetic products containing Histogen’s ... This agreement is an amendment to the existing license ...
(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 ...
(Date:1/14/2014)... 2014  RXi Pharmaceuticals Corporation (OTCQX: RXII), a biotechnology ... therapies addressing major unmet medical needs using RNA-targeted ... of Allowance from the United States Patent and ... (sd-rxRNA®), for the treatment of fibrosis. The patent ...
(Date:1/14/2014)... Orange, CA (PRWEB) January 14, 2014 Kerr ... a 10-minute video and additional how-to information about dual arch ... Great Restorations with Dual Arch Impressions,” the blog entry serves ... the technique and houses a step-by-step demonstration by Dr. David ...
Breaking Biology Technology:Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 2Histogen and Suneva Medical Expand License for Cell Conditioned Media-based Aesthetic Products Internationally 3World'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 8RXi Pharmaceuticals Receives US Notice of Allowance for a Key Patent Relating to its Self-Delivering Technology with sd-rxRNAs targeting CTGF, including RXI-109, for the Treatment of Fibrotic Disorders 2RXi Pharmaceuticals Receives US Notice of Allowance for a Key Patent Relating to its Self-Delivering Technology with sd-rxRNAs targeting CTGF, including RXI-109, for the Treatment of Fibrotic Disorders 3
... Consulting US, a division of London-based Double Helix ... Stuchiner to the position of Vice President. ... strategic pricing, reimbursement and market access consultants with ... product commercialization services to firms in the pharmaceutical, ...
... Calif., March 30 TorreyPines Therapeutics, Inc. (Nasdaq: ... District Court of the Southern District of New York ... of Axonyx Inc. ("Axonyx") against Axonyx and several of ... in 2006. The plaintiffs alleged that the defendants made ...
... 30 BioMedical Enterprises, Inc. (BME), a rapidly growing ... orthopaedic memory metal implants, announced today that it has ... and Marketing. BME specializes in nitinol implants that ... together to promote bone union. The O ...
Cached Biology Technology:Double Helix Appoints Ann Stuchiner Vice President of US Consulting Division 2Stockholder Suits Related to TorreyPines Therapeutics, Inc. Dismissed 2BioMedical Enterprises, Inc. (BME) Announces the Appointment of Keith M. Peeples as Vice President, Sales and Marketing 2
96 Well Plate Sterile, RE bottom; consistent medium binding affinity for hydrophobic complexes and proteins....
...
The Holten Horizontal series of laminar airflow work benches offers comfort and ease of use....
... Fixed Angle Polypropylene Rotor designed for ... Centra CL3/CL3R** and Centra-MP4/MP4R*. A translucent ... /MP4, ,EXCLUSIVE polypropylene rotor design provides ... repeatedly autoclaved. Polypropylene rotors are ...
Biology Products: