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:6/19/2013)... the journal Polar Biology, researchers report using DNA from tissues ... new type of killer whale ( Orcinus orca ). ... stranded on a New Zealand beach and a skeleton was ... but it was almost 50 years before this unique form ... and bulbous forehead, was documented alive in the wild. ...
(Date:6/19/2013)... Minn. , June 19, 2013 ... specializing in clinical study management systems, is pleased to ... to be held June 23-27 in Boston ... that MedNet, a recognized leader in cloud-based eClinical solutions, ... MedNet will be showcasing iMedNet™ EDC ...
(Date:6/19/2013)... A new variety of canary seeds bred specifically for ... be ideal for people with celiac disease (CD), scientists ... Journal of Agricultural and Food Chemistry . , ... least 3 million people in the United States alone ... eating wheat, barley, rye and other grains that contain ...
Breaking Biology News(10 mins):MedNet Solutions To Spotlight iMedNet EDC At The 49th DIA Annual Meeting 2
... Calling the results "extremely surprising," researchers from the ... report that methane gas concentrations in the Gulf of ... after a massive release occurred following the Deepwater Horizon ... led by oceanographers John Kessler of Texas A&M and ...
... exploring the genetic culprits behind a host of neuromuscular ... a team working at the National Institute of Standards ... single cells to extract and examine their mitochondria. ... "engines"the mitochondria that are in large part responsible for ...
... Jan. 6, 2011 News media now can apply for ... National Meeting & Exposition March 27-31, 2011, in Anaheim, Calif., ... Held during the International Year of Chemistry (IYC), ... Center and at area hotels. With nearly 9,500 presentations ...
Cached Biology News:UCSB, Texas A&M scientists find methane gas concentrations have returned to near-normal levels 2Extracting cellular 'engines' may aid in understanding mitochondrial diseases 2
(Date:6/20/2013)... Dental decay is the number one chronic disease ... Crisafulli of Crisafulli Dental those statistics are no longer daunting. ... and implemented a cavity prevention program developed by CariFree that ... to 74% . The system is known as ... a solution to dental decay that works,” says Dr. Crisafulli, ...
(Date:6/19/2013)... , June 20, 2013 ... productivity with technology solutions for pharmaceutical and chemical ... Glaxo Wellcome Manufacturing Pte. Ltd. and Siemens Pte. ... a new A*STAR R&D Consortium Programme - Innovative ... A*STAR,s Institute of Chemical and Engineering Sciences (ICES), ...
(Date:6/19/2013)... 19, 2013 An article posted earlier this ... increasing number of uses for probiotics. The article stated that ... the associate benefits may beeb listed, the actual use ... helping clear skin conditions. While the total uses of probiotics ... the the uses of these “miracle” bacterium, and debunked the ...
(Date:6/19/2013)... Clinverse, Inc. , a ... trials, today announced it will be exhibiting and ... in Boston, June 24-26, 2013. Clinverse’s eClinical ... fully configurable, cloud-based clinical financial lifecycle system. , ... Clinverse’s eClinical Commerce Network, automates site contract set-up ...
Breaking Biology Technology:Crisafulli Dental Launches Ground Breaking Cavity Prevention Program That Can Lower Decay Rates by 74% 2Pfizer, GSK, and Siemens Form R&D Consortium With A*STAR's Institute of Chemical & Engineering Sciences 2Pfizer, GSK, and Siemens Form R&D Consortium With A*STAR's Institute of Chemical & Engineering Sciences 3Pfizer, GSK, and Siemens Form R&D Consortium With A*STAR's Institute of Chemical & Engineering Sciences 4Natural Acne Remedy, Probiotic Action Explains the Science behind Using Probiotics for Better Health 2Clinverse, Inc. Exhibiting and Showcasing Its Technology at DIA 2013 2
... Stem cell-enriched autologous fat enables sustainable breast augmentation ... the media: For years a French company has been ... cause cancer. More than 100,000 women worldwide must now ... or carrying a "time bomb" in their bodies. Stem ...
... Biotherapeutics (OTC.BB: NWBO) (NW Bio) today announced that it will ... the Windsor Room of the Sir Francis Drake Hotel as ... emerging biotech companies held over 3 days this week in ... attendees are expected to be listening to presentations by up ...
... SEATTLE, Jan. 10, 2012  Omeros Corporation (NASDAQ: OMER ... selectively with each of GPR25, GPR32, GPR80, GPR135 and MAS1, ... unlocked by Omeros to 23, representing 30 percent of the ... unlocked by Omeros for drug development equals half of the ...
Cached Biology Technology:Silicone Scandal: Stem Cell Breast Augmentation a Safe Alternative 2NW Bio to Present Today at the OneMedForum SF 2012 Conference 2NW Bio to Present Today at the OneMedForum SF 2012 Conference 3Omeros Announces it has Unlocked 30 Percent of Class A Orphan GPCRs 2Omeros Announces it has Unlocked 30 Percent of Class A Orphan GPCRs 3Omeros Announces it has Unlocked 30 Percent of Class A Orphan GPCRs 4Omeros Announces it has Unlocked 30 Percent of Class A Orphan GPCRs 5
Tris-EDTA Buffer Solution, 1X, pH 8.0, sterile...
Chicken polyclonal to YebU ( Abpromise for all tested applications). Antigen: Full length YebU (Escherichia coli)...
Human Cell Line Slides...
Human Cell Line Slides...
Biology Products: