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:7/28/2014)... MIT professor John Essigmann and colleagues from the University of ... thought if they could induce the virus to mutate uncontrollably, ... a strategy that our immune system uses against many ... caused HIV to mutate at an enhanced rate, as expected. ... a small clinical trial reported in 2011. In a new ...
(Date:7/28/2014)... wild relative of the domestic tomato, has been published ... headed by Professors Neelima Sinha and Julin Maloof at ... genome information may help breeders produce tastier, more stress-tolerant ... journal Nature Genetics , was lead by Bjrn ... UC Davis labs carried out work on the transcriptome ...
(Date:7/28/2014)... suggest two ways to effectively address the problem that birth ... compared to women of a normal body mass index. , ... as the population has increased in weight, concern has grown ... have consistently found that obesity has a negative impact on ... how well the pill prevents pregnancy. , "Birth ...
Breaking Biology News(10 mins):Forced mutations doom HIV 2Forced mutations doom HIV 3Forced mutations doom HIV 4Strategies identified to improve oral contraceptive success with obese women 2
... University of Iowa researchers have found high levels of ... Indiana Harbor and Ship Canal (IHSC) in East Chicago, Ind. ... IHSC is scheduled to be dredged in spring 2012 to ... area of southern Lake Michigan. The study, published online ...
... time when Dr. Roberto Bolli received word that he ... National Institutes of Health for one research project, five ... University of Louisville have reached the successful endpoint of ... Institute of the NIH has funded Bolli,s program project ...
... The diamondback moth, Plutella xylostella , is ... has developed resistance to many chemical and biological pesticides, ... is approximately US$1billion annually. In a new article ... , researchers from Australia have identified the genes expressed ...
Cached Biology News:Researchers find high levels of toxic PCBs in Indiana Harbor and Ship Canal 2Researchers find high levels of toxic PCBs in Indiana Harbor and Ship Canal 3Louisville researcher awarded $12.8 million NIH grant renewal for adult stem cell project 2Louisville researcher awarded $12.8 million NIH grant renewal for adult stem cell project 3Diamondback moth host-parasite interaction unraveled 2
(Date:7/28/2014)... Louis, MO (PRWEB) July 28, 2014 ... software, and services that bring the power of genomics ... the inaugural Appistry Pipeline Challenge . , ... Bell, president of the National Center for Genome Resources, ... Mercy Hospitals and Clinics of Kansas City. Rounding out ...
(Date:7/28/2014)... 2014  InterMune, Inc. (NASDAQ: ITMN ) ... 2014 financial results at the close of the U.S. ... and webcast will be hosted by InterMune at 4:30 ... investors and others may participate in the conference call ... ID#21728775. A replay of the webcast and teleconference will be ...
(Date:7/28/2014)... The National Model Aviation Museum, located at the ... announce that it has been granted full civilian museum ... Air Force. , The certification is the culmination of ... with an on-site inspection by Sarah Sessions, Museum Certification ... National Museum of the United States Air Force , ...
(Date:7/25/2014)... , July 25, 2014 Amgen (NASDAQ: ... today declared a $0.61 per share dividend for the ... on Sept. 5, 2014, to all stockholders of record ... 2014.  About Amgen Amgen is committed ... from serious illnesses by discovering, developing, manufacturing and delivering ...
Breaking Biology Technology:Appistry Names Industry Experts from the National Center for Genome Resources and Mercy Children's, Kansas City, to Judge Pipeline Challenge Competition 2InterMune to Release Second Quarter Financial Results on August 6 2AMA’s National Model Aviation Museum Granted Full Civilian Museum Certification by the National Museum of the United States Air Force 2Amgen Announces 2014 Third Quarter Dividend 2Amgen Announces 2014 Third Quarter Dividend 3
... Transgenomic, Inc. (OTC/BB: TBIO) today reported financial results for ... business update. Second Quarter Financial ResultsNet sales ... increase of 50 percent compared with $5.1 million for the ... 59 percent of net sales, compared with gross profit of ...
... BETHESDA, Md., Aug. 11, 2011 The American College ... new ACMG Online Live Learning Center , which ... health care professionals. This valuable, on-demand resource brings the ... live learning offerings such as the Genetics Review Course ...
... GNVC ) today announced that its Board of ... through the adoption of a new Rights Agreement. The new ... 2011, which is the date that GenVec,s existing Rights Agreement ... in connection with the expiration of the existing Rights Agreement ...
Cached Biology Technology:Transgenomic Reports Second Quarter Financial Results 2Transgenomic Reports Second Quarter Financial Results 3Transgenomic Reports Second Quarter Financial Results 4Transgenomic Reports Second Quarter Financial Results 5Transgenomic Reports Second Quarter Financial Results 6Transgenomic Reports Second Quarter Financial Results 7Transgenomic Reports Second Quarter Financial Results 8Transgenomic Reports Second Quarter Financial Results 9ACMG Announces New Online Live Learning Center: Will Bring Genetics and Genomics Education to Varied Health Professionals 2GenVec Renews Stockholder Rights Plan 2GenVec Renews Stockholder Rights Plan 3
{3,8-diamino-5-[3-(diethylmethylammonio)propyl]-6-phenylphenanthridinium diiodide}. ,250 ug/ml Propidium Iodide (PI) in PBS....
... reagents for the isolation of genomic DNA. ... the isolation of genomic DNA from blood. ... the isolation of genomic DNA from plants. ... be used for restriction endonuclease digestion Southern ...
Concentration: 1mg/ml. Antigen: Propidium Iodide ...
Apoptosis Detection Systems and Reagents...
Biology Products: