Navigation Links
Mother of all humans lived 200,000 years ago
Date:8/17/2010

omputers.

But mitochondria -- the tiny organelles that serve as energy factories inside all human cells -- have their own genome. Besides containing 37 genes that rarely change, they contain a "hypervariable" region, which changes fast enough to provide a molecular clock calibrated to times comparable to the age of modern humanity. Because each person's mitochondrial genome is inherited from his or her mother, all mitochondrial lineages are maternal.

To infer mtEve's age, scientists must convert the measures of relatedness between random blood donors into a measure of time.

"You have to translate the differences between gene sequences into how they evolved in time," said co-author Krzysztof Cyran, vice head of the Institute of Informatics at Silesian University of Technology in Gliwice, Poland. "And how they evolved in time depends upon the model of evolution that you use. So, for instance, what is the rate of genetic mutation, and is that rate of change uniform in time? And what about the process of random loss of genetic variants, which we call genetic drift?"

Within each model, the answers to these questions take the form of coefficients -- numeric constants that are plugged into the equation that returns the answer for when mtEve lived.

Each model has its own assumptions, and each assumption has mathematical implications. To further complicate matters, some of the assumptions are not valid for human populations. For example, some models assume that population size never changes. That is not true for humans, whose population has grown exponentially for at least several thousand generations. Other models assume perfect mixing of genes, meaning that any two humans anywhere in the world have an equal chance of producing offspring.

Cyran said human genetic models have become more complex over the past couple of decades as theorists have tried to correct for invalid assumptions. But some of the corrections -- like
'/>"/>

Contact: Jade Boyd
jadeboyd@rice.edu
713-348-6778
Rice University
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. Mother Nature to provide an environmentally friendly method for reducing mosquitoes
2. TGen finds protein inhibitor revives chemotherapy for ovarian patients
3. About 94 percent of breastfeeding mothers do not follow a proper diet
4. Can a mothers voice spur recovery from a coma?
5. Giving DHA supplements to breastfeeding mothers
6. HPV vaccination more likely if mothers approve
7. Babys obesity risk: Whats the mothers influence?
8. Baby monkeys receive signals through their mothers breast milk
9. Mother bats expert at saving energy
10. Mothers exposure to bisphenol A may increase childrens chances of asthma
11. Climate debate: Whats warming us up? Human activity or Mother Nature?
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/27/2014)... North Carolina State University have found that century-old museum specimens ... common insect pest that can weaken and kill trees ... that scale insect populations increase on oak and maple trees ... pests may also increase with global warming," says Dr. Elsa ... of a paper on the work. , "More scale insects ...
(Date:8/26/2014)... University in St. Louis have developed algorithms to identify ... tearing or breaking. The technology, which needs to be ... may help pinpoint minor strains and tiny injuries in ... The research is available online Aug. 27 in the ... publishes research at the nexus of the physical and ...
(Date:8/26/2014)... colony of harmful bacteria, biofilms make the treatment ... a biofilm pose a significant health risk due ... and biofilm-protected bacteria account for some 80 percent ... 50 to 1,000 times more resistant to antibiotics ... may have stumbled onto a magic bullet," said ...
Breaking Biology News(10 mins):Museum specimens, modern cities show how an insect pest will respond to climate change 2New technology may identify tiny strains in body tissues before injuries occur 2New technology may identify tiny strains in body tissues before injuries occur 3Breakthrough antibacterial approach could resolve serious skin infections 2Breakthrough antibacterial approach could resolve serious skin infections 3
... system, every protein made in the cell has a specific ... proteins to their appropriate target. Researchers at Boston University ... images of these channels as they open to allow proteins ... made. These findings are published as a Letter in ...
... apps, cameras, and mobile internet to navigate strange cities in ... in line, and upload their videos directly to social media ... high-tech savvy can save a well-loved device from dying when ... same basic ailment that plagues solar power plants and wind ...
... A drug currently on the market to treat leukemia reversed ... findings by medical researchers with the University of Alberta. ... team,s discovery in the peer-reviewed journal, PLOS ONE . ... can also play an important role in the development of ...
Cached Biology News:Researchers capture images of open channel that moves proteins across cell membranes 2Futuristic copper foam batteries get more bang for the buck 2Futuristic copper foam batteries get more bang for the buck 3UAlberta medical researchers discover potential new treatment for colitis 2UAlberta medical researchers discover potential new treatment for colitis 3
(Date:8/27/2014)... August 27, 2014 Flagship Biosciences LLC, ... services to the pharmaceutical and medical device industries, has ... The fast growing company has consolidated its histology and ... Boulder to Westminster, CO, just north of Denver. ... 7575 W. 103rd Ave., Suite 100, Westminster, CO 80021 ...
(Date:8/27/2014)... , Aug. 27, 2014 Research and ... "Global Enzyme for Pulp & Paper Industry Report 2014" ... Global Enzyme for Pulp & Paper Industry Report 2014 ... state of the global enzyme for pulp & paper ... of the industry including definitions, classifications, applications and industry ...
(Date:8/27/2014)... Aug. 27, 2014 Research and Markets ... Isotope Ratio Mass Spectrometer Industry Report 2014" report ... Isotope Ratio Mass Spectrometer Industry Report 2014 is a ... the global isotope ratio mass spectrometer industry. ... including definitions, classifications, applications and industry chain structure. The ...
(Date:8/27/2014)... -- ARCH Venture Partners, one of the largest U.S. ... seed and early-stage advanced technology companies, today announced ... than $400 million in subscriptions. ARCH Venture Fund ... more than $150 million. "The enthusiasm ... of our approach to finding and funding new ...
Breaking Biology Technology:Flagship Biosciences Announces Relocation and Expansion 2Global Enzyme for Pulp & Paper Industry Report 2014 2Global Stable Isotope Ratio Mass Spectrometer Industry Report 2014 2Latest ARCH Venture Partners Fund Closes Above $400 Million 2Latest ARCH Venture Partners Fund Closes Above $400 Million 3
... the Board ... Neill Named President, ISELIN, N.J., Jan. 3 Pharmos Corporation,(Nasdaq: ... effective immediately., Board Changes, Robert F. Johnston has been elected ... and Mony Ben Dor have retired from,the Board., The Pharmos Board ...
... Jan. 3 Cambrex,Corporation (NYSE: CBM ) ... President and Chief Executive Officer, will make a ... on January 8, 2008 at,9:00 a.m. PST at ... (Logo: http://www.newscom.com/cgi-bin/prnh/20000613/CAMBREXLOGO ), A live ...
... Manufacture; Genzyme will Continue to Market and ... ... CAMBRIDGE, Mass., Jan. 3 ,BioMarin Pharmaceutical Inc. (Nasdaq and SWX: ... restructuring of their joint venture,regarding Aldurazyme(R) (laronidase). Under the revised ...
Cached Biology Technology:Pharmos Corporation Announces Board and Management Changes 2Pharmos Corporation Announces Board and Management Changes 3BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 2BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 3BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 4BioMarin and Genzyme Restructure Aldurazyme 50/50 Joint Venture 5
Biotin-OSu is used to label proteins, immunological agents, DNA and synthetic oligonucleotides. Biotin labeling is detected through enzymatically labeled avidin or streptavidin proteins that conforma...
EGTA, 10 g. Ethylene glycol-O,O-bis-[2-amino-ethyl]-N,N,N,N,-tetraacetic acid.Assay: > 99.0%. Category: Nucleotides & Enzymes & Biochemicals, Ultrapure Biochemicals ....
GOAT ANTI FRK...
UV LAMP 300 NM 8W T5, 1 EA. Category: Nucleid Acid Detection Systems....
Biology Products: