Quantcast

Latest Phylogenetics Stories

2011-02-24 23:34:57

Studying the many potential reasons why the same trait has independently evolved in different species (homoplasy) can improve our understanding of the genetic, developmental and evolutionary relationships among species With the genetics of so many organisms that have different traits yet to study, and with the techniques for gathering full sets of genetic information from organisms rapidly evolving, the "forest" of evolution can be easily lost to the "trees" of each individual case and...

2010-09-21 11:04:36

The scientists who put an innovative tree of life online last year now have made that same resource available -- free -- for smartphones. The new "TimeTree" application lets anyone with an Apple iPhone harness a vast Internet storehouse of data about the diversity of life, from bacteria to humans. The intuitive interface is designed to answer a simple question, quickly and authoritatively: how long ago did species A and species B share a common ancestor? "Our new iPhone app can be fun for...

2010-06-30 12:30:33

The initial peopling of North America from Asia occurred approximately 15,000-18,000 years ago, however estimations of the genetic diversity of the first settlers have remained inaccurate. In a report published June 29 in Genome Research, researchers have found that the diversity of the first Americans has been significantly underestimated, underscoring the importance of comprehensive sampling for accurate analysis of human migrations. Substantial evidence suggests that humans first crossed...

2010-06-07 14:07:55

A lesson from flashy Central American warblers Modern evolutionary systematists often use molecular methods, such like mitochondrial DNA analysis, to differentiate between species and subspecies. These molecular methods are a flashy symbol of modern science cleverly exploited by media to draw interest of public and by laboratory scientists to draw attention of government funding agencies. However, current research indicates that the picture painted by these methods may be false, and only a...

2010-05-18 08:15:18

A new "tree of life" has been constructed by researchers at the Virginia Bioinformatics Institute (VBI) at Virginia Tech for the gamma-proteobacteria, a large group of medically and scientifically important bacteria that includes Escherichia coli, Salmonella typhimurium, and other disease-causing organisms.* By building powerful phylogenetic trees, scientists are able to quickly identify similarities and differences between the make-up of many different organisms, crucial information in the...

35fc1c36cca0208beabdccb66170f9961
2010-04-16 08:22:16

Finds that cells without mitochondrial fusion have less mtDNA, more mutations in their mtDNA, and less ability to tolerate those mutations A typical human cell contains hundreds of mitochondria"”energy-producing organelles"”that continually fuse and divide. Relatively little is known, however, about why mitochondria undergo this behavior. In a paper published in the April 16 issue of the journal Cell, a team of researchers"”led by scientists at the California Institute of...

a9f5371b9b19a199da7c8668816ffc541
2010-03-12 12:25:00

New evidence that specialized adaptations are not evolutionary dead ends Blind scorpions that live in the stygian depths of caves are throwing light on a long-held assumption that specialized adaptations are irreversible evolutionary dead-ends. According to a new phylogenetic analysis of the family Typhlochactidae, scorpions currently living closer to the surface (under stones and in leaf litter) evolved independently on more than one occasion from ancestors adapted to life further below the...

ea4c1e19d0ad7457380bbdb93f92067f
2009-11-10 13:34:17

Penguins that died 44,000 years ago in Antarctica have provided extraordinary frozen DNA samples that challenge the accuracy of traditional genetic aging measurements, and suggest those approaches have been routinely underestimating the age of many specimens by 200 to 600 percent. In other words, a biological specimen determined by traditional DNA testing to be 100,000 years old may actually be 200,000 to 600,000 years old, researchers suggest in a new report in Trends in Genetics, a...

c0b98df04a697d62c5d7a9a57ebdccc01
2009-10-21 11:55:11

A team of Spanish and Portuguese researchers has carried out molecular genetic analysis of the Y chromosome (transmitted only by males) of the aboriginal population of the Canary Islands to determine their origin and the extent to which they have survived in the current population. The results suggest a North African origin for these paternal lineages which, unlike maternal lineages, have declined to the point of being practically replaced today by European lineages. Researchers from the...

e63b7c6fbf1bc015add6dd0c034e616a1
2009-08-24 06:05:00

A free online collaborative encyclopedia which aims to document all of the 1.8 million living species known to science has hit 170,000 entries so far and is helping research into many things, including aging, climate change, and the spread of insect pests. In 2007, the website "Encyclopedia of Life" was first launched, anticipated to cost somewhere in the ballpark of $100 million. It is compiled from existing databases and from contributions from experts as well as non-experts across the...


Word of the Day
blee
  • Color; hue; complexion.
This word is Middle English in origin.
Related