Navigation Links
Evolution's past is modern human's present
Date:9/7/2011

is more prevalent in west-central African populations, possibly reflecting a hybridization event or process that took place in central Africa," he said. "The populations that interbred were similar enough biologically so that they were able to produce fertile offspring, thus allowing genes to flow from one population to the other."

Hammer and team studied DNA sequence data from three sub-Saharan African populations: Mandenka, Biaka and San to test models of African archaic admixture.

The Mandenka are an agricultural population from West Africa, while the Biaka and the San are historically isolated hunter-gatherer populations from Central and Southern Africa, respectively.

The team conducted extensive simulations to test the likelihood of gene flow from an archaic population to anatomically modern humans. The simulations rejected the default position, or null hypothesis, that no admixture took place.

The result gave the scientists confidence to infer that contemporary African populations contain a small proportion of genetic material--about 2 percent--that moved from a species of archaic humans into the gene pool of anatomically modern humans about 35 thousand years ago.

They surmise that this archaic population split from the ancestors of anatomically modern humans about 700 thousand years ago.

"We do not have ancient DNA, i.e., from a fossil specimen, to directly compare with DNA from contemporary populations, so our approach was indirect or inferential," said Hammer. But there are several candidates in the African fossil record that may have added their genetic material to modern humans such as Homo heidelbergensis, an extinct species of the genus Homo that lived between 600 and 400 thousand years ago.

"This study represents an approach to answering long-standing questions about the contributions of archaic, extinct forms of our genus to the gene pool of our modern human species," said Carolyn Ehardt,
'/>"/>

Contact: Bobbie Mixon
bmixon@nsf.gov
703-292-8485
National Science Foundation
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Researchers discover oldest evidence of nails in modern primates
2. Modern fish communities live fast and die young
3. Modern EU agriculture jeopardizes biodiversity in new member states
4. Mummies tell history of a modern plague
5. Low-cost molecular medicine should be included in modern eye physicians tool kit
6. Living dinosaurs: The evolutionary history of modern birds
7. Paleontologists audition modern examples of ancient behavior
8. Ancient teeth raise new questions about the origins of modern man
9. 40-year-old test procedure finds modern niche in developing new medicines
10. The brains of Neanderthals and modern humans developed differently
11. Modern humans emerged far earlier than previously thought
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Evolution's past is modern human's present
(Date:12/5/2014)... 2014 Increased emphasis on product quality, ... testing and inspection technologies. The convergence of industries ... range of innovative test solutions. This trend is ... which is generally more inclined towards communication, media ... strategies of test equipment vendors will cater to ...
(Date:12/3/2014)... Dec. 2, 2014   Marvin Test Solutions ... test solutions for military, aerospace, and manufacturing organizations, ... its successful TS-900 PXI semiconductor test platform ... of high-end systems to customers at a fraction ... to traditional ATE. "Our semiconductor ...
(Date:11/21/2014)... 19, 2014  Earlier this year Donald Spector ... and one of the most prolific inventors in the ... transmitted from Smartphones to third party agencies. Spector envisioned ... one of the earliest known patents in this area. ... the military, child care, elder care and hospital applications. ...
Breaking Biology News(10 mins):Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 2Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 3Emerging Technologies Enable Smarter Monitoring of Assets, Push Industrial Testing, Inspection and Monitoring Market 4Marvin Test Solutions Brings New Capabilities to PXI-Based Semiconductor Test with TS-960 2Marvin Test Solutions Brings New Capabilities to PXI-Based Semiconductor Test with TS-960 3Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 2Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 3Patented Biosensor Wearable Technology Provides a More Civilized Method of Quarantine 4
... pushing tomato plants to produce more fruit might not lie ... from Cold Spring Harbor Laboratory (CSHL) suggests that an increase ... timer or so-called "maturation clock" that determines the number of ... that a delay in this clock causes more branching to ...
... Lightning fast and yet highly sensitive: HHblits is a ... significantly improve the functional analysis of proteins. A team ... LMU,s Genzentrum has developed a new sequence search method ... is faster and can discover twice as many evolutionarily ...
... release is available in Spanish . , Barcelona, ... been discovered that neutrophils exist in the spleen without there ... group on the Biology of B Cells of IMIM (Hospital ... Sinai in New York, has also made it possible to ...
Cached Biology News:Study uncovers a molecular 'maturation clock' that modulates branching architecture in tomato plants 2Study uncovers a molecular 'maturation clock' that modulates branching architecture in tomato plants 3Faster, more accurate, more sensitive 2Faster, more accurate, more sensitive 3Discovered the existence of neutrophils in the spleen 2
(Date:12/19/2014)... Reports from CDC show ... from one or more chronic health conditions - including ... address some of these diseases, but may not eliminate ... face. While implanted nerve stimulation devices today offer relief, ... which can induce side effects. , To eliminate ...
(Date:12/19/2014)... , Dec. 18, 2014  Decision Resources Group finds ... biomaterial market will grow moderately through 2023 as the ... growing awareness of dental biomaterials all spur procedure volumes. ... as China and ... dental procedures within reach for a larger proportion of ...
(Date:12/17/2014)... Based on the revenues gained from ... is dominated by four major players contributing to ... players include GE Healthcare (U.K.), Siemens AG (Germany), ... Full Report Copy at http://www.marketsandmarkets.com/Market-Reports/surgical-imaging-market-210534462.html , ... attributed to its strong product portfolio, which includes ...
(Date:12/17/2014)... (PRWEB) December 17, 2014 This ... Global Quartz Tubing industry. For an overview analysis, ... classification, application, industry chain structure, industry overview, policy ... quartz tubing industry has witnessed rapid development ... number of acquisitions. This report mentions quartz tubing ...
Breaking Biology Technology:Draper Wins GSK Funding for Smaller, Smarter Implantable Devices 2Asia Pacific Dental Biomaterial Market Will Grow Strongly Through 2023 2Asia Pacific Dental Biomaterial Market Will Grow Strongly Through 2023 3Global Refurbished Surgical Imaging Market by Product & Application is Estimated to Reach $1.25 Billion by 2019 - New Research Report by MarketsandMarkets 2Global Refurbished Surgical Imaging Market by Product & Application is Estimated to Reach $1.25 Billion by 2019 - New Research Report by MarketsandMarkets 3Global Refurbished Surgical Imaging Market by Product & Application is Estimated to Reach $1.25 Billion by 2019 - New Research Report by MarketsandMarkets 42020 Quartz Tubing Market: Global Development & Forecasts Analysis Now at DeepResearchReports.com 2
Whitewater, Wis . - Sharon Ethanol , a subsidiary of <a...
... the online social media era, there are many companies trying ... ranged from total site revamps to well thought-out, limited-term campaigns ... interesting to review some recent examples demonstrating these concepts and ... , ,With Michael Dell back at the helm, Dell ...
... note: John Wade, VP/CIO, Saint Luke's Health System of Kansas City, ... Conference May 9 and 10 in Madison. He recently spoke ... assessment of the state of health information technology. , , ... of electronic health records? , , John Wade ...
Cached Biology Technology:On the case: Web lessons for connecting with customers 2On the case: Web lessons for connecting with customers 3On the case: Web lessons for connecting with customers 4On the case: Web lessons for connecting with customers 5Visions: Wade offers straight talk on e-medical records 2Visions: Wade offers straight talk on e-medical records 3Visions: Wade offers straight talk on e-medical records 4Visions: Wade offers straight talk on e-medical records 5
Immunogen: Synthetic Peptide: V(22) N G H E F E I E G E G E G R(36) Storage: -20 C, Avoid Freeze/Thaw Cycles...
Human GFR alpha-4 Affinity Purified Polyclonal Ab...
Mouse Endoglin/CD105 Fluorescein MAb (Clone 209701)...
Human Siglec-9 Biotinylated Affinity Purified Pab...
Biology Products: