Navigation Links
Ancient humans were mixing it up
Date:9/5/2011

ia for being archaic DNA still present in the genomes of sub-Saharan Africans. Interestingly, this signature was strongest in populations from central Africa."

The scientists applied several criteria to tag a DNA sequence as archaic. For example, if a DNA sequence differed radically from the ones found in a modern population, it was likely to be ancient in origin. Another telltale sign is how far it extends along a chromosome. If an unusual piece is found to stretch a long portion of a chromosome, it is an indication of being brought into the population relatively recently.

"We are talking about something that happened between 20,000 and 60,000 years ago not that long ago in the scheme of things," Hammer said. "If interbreeding occurs, it's going to bring in a whole chromosome, and over time, recombination events will chop the chromosome down to smaller pieces. And those pieces will now be found as short, unusual fragments. By looking at how long they are we can get an estimate of how far back the interbreeding event happened."

Hammer said that even though the archaic DNA sequences account for only two or three percent of what is found in modern humans, that doesn't mean the interbreeding wasn't more extensive.

"It could be that this represents what's left of a more extensive archaic genetic content today. Many of the sequences we looked for would be expected to be lost over time. Unless they provide a distinct evolutionary advantage, there is nothing keeping them in the population and they drift out."

In a next step, Hammer's team wants to look for ancient DNA regions that conferred some selective advantage to the anatomically modern humans once they acquired them.

"We think there were probably thousands of interbreeding events," Hammer said. "It happened relatively extensively and regularly."

"Anatomically modern humans were not so unique that they remained separate," he added. "They have always excha
'/>"/>

Contact: Daniel Stolte
stolte@email.arizona.edu
520-626-4402
University of Arizona
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Ancient whale skulls and directional hearing: A twisted tale
2. Penn study shows an ancient crop effective in protecting against a 21st century hazard
3. Ancient glacial melting process similar to existing concerns about Antarctica, Greenland
4. Endangered river turtles genes reveal ancient influence of Maya Indians
5. Genetic switch for limbs and digits found in ancient fish
6. Ancient symbiosis between animals and bacteria discovered
7. Ancient species of mayfly had short, tragic life
8. Adjustable valves gave ancient plants the edge
9. Significant role of oceans in onset of ancient global cooling
10. Scientists discover fossil of giant ancient sea predator
11. Battle scars found on an ancient sea monster
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Ancient humans were mixing it up
(Date:12/17/2014)... Dec. 16, 2014 Valencell, a leader in performance ... technology to industry leaders such as Intel, Jabra, Atlas, ... biometric wearable products. These products will be showcased at ... Las Vegas . "Our partners ...
(Date:12/17/2014)... 16, 2014  Automation is fundamentally transforming the travel experience ... borders. Over the past decade, ePassports, biometric readers, and ... process through border control via eGates and Automated Passport ... seaports, and land borders across the globe. ...
(Date:12/11/2014)... 2014 Research and Markets , ... has announced the addition of the "Biometrics Market ... One major trend emerging in this ... technology, it is important to upgrade biometric solutions to ...
Breaking Biology News(10 mins):Valencell PerformTek Biometrics Power the Most Accurate Wearables at CES 2015 2Automated 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 2Biometrics Market in the APAC Region 2015-2019: Key Vendors are 3M Cogent, NEC, Safran and Suprema 2
... --- How do children reason about the natural world? ... non-human animals? For decades, the consensus was that ... they adopt an "anthropocentric" stance, favoring humans over non-human ... animals. But Northwestern University researchers have taken ...
... Southhampton and Cambridge Universities in the UK have presented ... in stronger hip bones. The results were presented at ... Italy. More than 200 six-year olds participated in ... bone mass and analysed the structure of the femoral ...
... as environmentally friendly sources of renewable energy, but which ... on developing? A new study involving researchers from North ... chemicals react when burned. Their data and new computer ... and technologies to maximize energy efficiency while minimizing environmental ...
Cached Biology News:Animals talk, sing and act like humans? 2Study paves way for new biofuels models, technologies 2
(Date:1/22/2015)... Davis, California (PRWEB) January 22, 2015 ... of Accelerator Mass Spectrometry (AMS) services to the pharmaceutical ... PhD has joined the company in the position of ... 30 years of broad and valuable experience in drug ...
(Date:1/22/2015)... Cambridge Semantics, the leading provider of smart data solutions driven ... record-breaking year across the board for the company. , ... and our Smart Data solutions, our customers were able to ... to record growth for the company in 2014,” said Alok ...
(Date:1/22/2015)... zFlo Motion , a US leader in biomechanics software ... a new partner. STT-Systems has developed an impressive ... with offerings in the optical-motion capture, 3D scanning, and industrial ... unit), iSen, is opening eyes around the world. With no ...
(Date:1/22/2015)... BRUNSWICK , Nueva Jersey , 22 de ... Award for Biomedical Research abre hoy su llamada a ... personas cuya investigación científica ha hecho, o tiene el ... la salud humana. Las nominaciones se aceptarán hasta el ...
Breaking Biology Technology:Eckert & Ziegler Vitalea Science appoints Mark Seymour, PhD as Director of Science & Technology 2Eckert & Ziegler Vitalea Science appoints Mark Seymour, PhD as Director of Science & Technology 3Cambridge Semantics Announces Record Results for 2014 23D Motion Capture Just Got Easy 2El 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 4
... BioLife Solutions, Inc.,(OTC Bulletin Board: BLFS), a ... storage and cryopreservation media products for cells,tissues, ... joined the Biomedical,Excellence for Safer Transfusion (BEST) ... and commercial partners whose,mission is to explore ...
... AlloSource, one of the nation,s largest non-profit providers of ... surgical procedures, will this year sponsor one of the ... in the January 1 Tournament of Roses Parade(R). The ... to the millions of people touched by organ, tissue ...
... California (USC) have, for the first time in history, derived ... will enable scientists to create far more effective animal models ... , The research will be published in the Dec. 26 ... is a major development in stem cell research because we ...
Cached Biology Technology:BioLife Solutions Joins Prestigious Biomedical Excellence for Safer Transfusion Collaborative 2BioLife Solutions Joins Prestigious Biomedical Excellence for Safer Transfusion Collaborative 3AlloSource, Tissue Recipient Join 'Stars of Life' Affected by Organ and Tissue Donation Aboard Donate Life Float in 2009 Rose Parade(R) 2AlloSource, Tissue Recipient Join 'Stars of Life' Affected by Organ and Tissue Donation Aboard Donate Life Float in 2009 Rose Parade(R) 3USC researchers derive first embryonic stem cells from rats 2USC researchers derive first embryonic stem cells from rats 3
... Multi-Disciplinary Team The Schleicher & ... stand-alone work center dedicated to custom ... The facilitys experienced project teams, comprised ... Marketing professionals, work closely with collaborators ...
... for proteomic scale kinase profiling, quantitative ... drug discovery research built on the ... synthesis platform. These microarrays are available ... Kinase Substrate - Peptide Microarray Service. ...
... is a commonly used technique for studying ... are electrophoresed on SDS-PAGE and transferred to ... where they are probed with specific antibodies. ... reuse of Southern and Northern blots, it ...
... Microarrays designed for immunological studies, vaccine ... the flexible and powerful Paraflo microfluidic ... available as part of our comprehensive ... Custom Probe Content Probe content ...
Biology Products: