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:12/19/2014)... , Dec. 18, 2014 Research and Markets ... "Micro Market Monitor: North America Perimeter Security Systems Market" ... The North American perimeter security market is ... to 2019. Although the U.S. market holds a larger share ...
(Date:12/17/2014)... BELVOIR, Va. , Dec. 15, 2014 The ... it easier to detect and prevent counterfeit microcircuits from ... agency started performing an in-house microcircuit anti-counterfeit initiative dubbed ... purchased microcircuits while increasing their reliability throughout the supply ...
(Date:12/17/2014)... is fundamentally transforming the travel experience and nowhere is ... past decade, ePassports, biometric readers, and secure document scanners ... control via eGates and Automated Passport Control (APC) Kiosks ... borders across the globe. According to ...
Breaking Biology News(10 mins):Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 2Micro Market Monitor: North America Perimeter Security Systems Market (Intrusion Detection Sensor, Video Surveillance, Communication/Alarm and Notification, Access Control System) 3Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 2Defense Logistics Agency Launches DNA Marking Capability to Strengthen Microcircuit Supply Chain 3Automated Border Control (ABC) Transforms the Global Travel Experience With More Than 2500 ABC eGates and APC Kiosks Deployed In Airports, Seaports, and Land Borders Worldwide 2
... University Hospitals Case Medical Center (UHCMC) and Case Western Reserve ... study to determine the safety and effectiveness of a new ... have never been vaccinated against the disease. The study is ... The current FDA-approved vaccine, Dryvax®, is not recommended for use ...
... so bad after all when it comes to Alzheimer’s disease. ... of Clinical Investigation, a team of scientists from the University ... a known villain when it comes to parsing out damage ... the opposite in Alzheimer’s disease, protecting the brain and helping ...
... Primary Industries (DPI) fisheries scientists are investigating ways to ... then released by anglers. , Some guidelines designed to ... snapper, silver trevally, mulloway, sand whiting, yellowfin bream and ... $1.5 million and funded by NSW DPI and the ...
Cached Biology News:Innovative smallpox vaccine research study to be conducted at Case Medical Center 2Brain inflammation may be friend, not foe, for Alzheimer's patients 2Brain inflammation may be friend, not foe, for Alzheimer's patients 3Brain inflammation may be friend, not foe, for Alzheimer's patients 4Releasing fish for the future 2
(Date:1/22/2015)... Jersey , 22 de enero de 2015  El Dr. ... hoy su llamada a nominaciones para 2015. Este prestigioso ... hecho, o tiene el potencial para hacer, contribuciones destacadas ... se aceptarán hasta el 15 de marzo de 2015 ...
(Date:12/25/2014)... The report “Service Quality Management and Telco Customer Experience ... Global Advancements, Worldwide Forecasts & Analysis (2014-2019)” defines and ... of revenues. , Browse 152 market data tables, ... on “Service Quality Management (SQM) and Telco Customer Experience ...
(Date:12/24/2014)... “Preparative & Process Chromatography Market by ... Solvents, Buffers, Valves, Guages, Seals), Accessories, Services, End ... to 2019” provides a detailed overview of the ... and strategies impacting the preparative and process chromatography ...
(Date:12/24/2014)... According to Ross Selinger, President of ... Global, the national office market continues to be strong, driven ... evidenced by the third quarter’s surprising 3.9% GDP, unemployment decreasing ... costs have held inflation down and the Fed is keeping ...
Breaking Biology Technology:El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 2El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 3El Dr. Paul Janssen Award for Biomedical Research emite su llamada a los nominados para 2015 4Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 2Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 3Service Quality Management Market worth $2.1 Billion & Telco Customer Experience Management Market worth $2.3 Billion by 2019 – New Report by MarketsandMarkets 4Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 2Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 3Preparative and Process Chromatography Market is expected to reach $9 billion by 2019 - New Report by Marketsandmarkets 4ITRA Global Reports Long Island Is Out of Sync With The National Office Market 2ITRA Global Reports Long Island Is Out of Sync With The National Office Market 3
... The Mountain States Health Alliance , a regional health ... with the Milwaukee-based Johnson Controls, Inc. , for ... InnerWireless System will be installed throughout the health care ... coverage for a variety of voice and data services. ...
... of the employers youve been tangoing with for the last three ... an interview but squared. It means they really like you. , ... to mention the prospect of getting a real paycheck if were ... a job is not like going on a first date. Its ...
... - Madison In a finding that may cause a ... a therapy for Alzheimer's disease, a team of researchers led ... School of Pharmacy , has discovered that increased expression ... halt the progression of the disease. The findings appear in ...
Cached Biology Technology:Tennessee health care system to install Johnson Controls wireless tech 2Ten red flags in your Midwest technology offer letter 2Ten red flags in your Midwest technology offer letter 3Ten red flags in your Midwest technology offer letter 4Ten red flags in your Midwest technology offer letter 5Discovery may halt progression of Alzheimer's 2Discovery may halt progression of Alzheimer's 3Discovery may halt progression of Alzheimer's 4
Ps-Aeruginosa (IgG) -Ab EIA Sample Size: 100 l...
...
Automated -80° C sample library for microplates and cryotube racks in SBS format; for integration into automated processes....
... FROM MOISTURE. AVOID FREEZE/THAW CYCLES. This kit ... in vitro by DNA affinity-mediated capture ... detection. In this assay, mono- and oligonucleosomes ... Anti-Histone 3 (H3) biotin-labeled antibody then binds ...
Biology Products: