Monthly Archives: March 2014

Stun DNA Mini#6
Hope u enjoyed! if you guys enjoyed please leave a like and comment! help me get 15 likes! also i just joined Stun thanks to Ajs ! a big opportunity for me! ...

By: Stun DNA

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Stun DNA Mini#6 - Video

Stop Motion Video: DNA Replication

By: StudentVideos2013

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Stop Motion Video: DNA Replication - Video

How To Allow RepoSystems GPS DNA PCv thru Firewall!
How To Allow RepoSystems GPS DNA PCv thru Firewall!

By: TheRepoSystems

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How To Allow RepoSystems GPS DNA PCv thru Firewall! - Video

DNA Part 3

By: Open Arms

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DNA Part 3 - Video

Tom #39;s Diner - D.N.A. feat Suzanne Vega (HQ Audio) by Wat Remix
Tom #39;s Diner - D.N.A. feat Suzanne Vega (HQ Audio) by Wat Remix.

By: charm power

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Tom's Diner - D.N.A. feat Suzanne Vega (HQ Audio) by Wat Remix - Video

Were still ENGAGED dna trapped tricked maury

By: philipinecuisine crinack

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Were still ENGAGED dna trapped tricked maury - Video

So why did the chicken cross the Pacific? Well, apparently it didn't. At least not all the way.

Scientists looking into the DNA of ancient and modern chicken breeds found throughout Micronesia and Polynesia have determined that they are genetically distinct from those found in South America. The research runs counter to a popular theory that Polynesian seafarers might have reached the coast of South America hundreds of years ago, before European explorers.

Among the intriguing indications that contact might have been made between Polynesians and the native peoples of South America was the supposed pre-Columbian presence of non-native chickens, allegedly introduced to the continent by seafarers from South Pacific islands. More evidence comes from the ubiquity of the sweet potato, a South American native, in the South Pacificit was already widespread throughout the islands by the time James Cook sailed into the region in 1770. (See National Geographic's South Pacific photos.)

Now it appears the chicken link, at least, may be severed, according to Alan Cooper, director of the Australian Centre for Ancient DNA, a co-author of the study published this week in the Proceedings of the National Academy of Sciences.

Researchers sequenced mitochondrial DNA from 22 chicken bones found at Polynesian archaeological sites and 122 feathers from modern chickens living on islands across the South Pacific. They used an enzyme to remove any contamination by modern DNA that may have clouded the results of earlier studies. When the team compared the "cleaned-up" DNA of Polynesian chickens with that of ancient and modern South American chickens, they found the two groups were genetically distinct.

The chicken DNA does not support a connection between the peoples separated by the Pacific, Cooper said. "Indeed, the lack of the Polynesian sequences [of DNA] in modern South American chickens ... would argue against any trading contact as far as chickens go."

Cooper and his colleagues were able to trace the origins of Polynesian chickens back in time and across the Pacific, following the lines of what must rank as one of the boldest, most romantic, and least understood human migrations of all timethe peopling of the tropical islands of the South Seas.

"We can show [from chicken DNA] that the trail heads back into the Philippines," Cooper said. "We're currently working on tracing it farther northward from there. However, we're following a proxy, rather than the actual humans themselves."

Tahitians sail and paddle rafts in an engraving done a few years after Captain James Cook explored Polynesia and Tahiti, then called Otaheite.

ILLUSTRATION BY SSPL, GETTY

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Chicken DNA Challenges Theory That Polynesians Beat Europeans to Americas

hide captionA Filipino chicken vendor in Quezon City, east of Manila, Philippines. Researchers say Pacific island chicken are genetically similar to the variety found in the Philippines, but different from South American chicken.

A Filipino chicken vendor in Quezon City, east of Manila, Philippines. Researchers say Pacific island chicken are genetically similar to the variety found in the Philippines, but different from South American chicken.

An analysis of DNA from chicken bones collected in the South Pacific appears to dispel a long-held theory that the ubiquitous bird first arrived in South America aboard an ancient Polynesian seafarer's ocean-going outrigger.

Instead, researchers who sequenced mitochondrial DNA from modern and ancient chicken specimens collected from Polynesia and the islands of Southeast Asian found those populations are genetically distinct from chickens found in South America.

"[The] lack of the Polynesian sequences [of DNA] in modern South American chickens ... would argue against any trading contact as far as chickens go," says Alan Cooper, director of the Australian Centre for Ancient DNA, who is a co-author in the study published this week in Proceedings of the National Academy of Sciences.

(For a treatise on the origins of the domesticated chicken, and how the bird came to play such a key role in the human diet, see this.)

The finding may shed light on one of the most vexing questions in modern anthropology: Did South Pacific seafarers, who evidence shows settled island chains separated by vast stretches of ocean, reach the coast of South America before the time of Christopher Columbus?

The evidence is contradictory.

In a similar study published in 2007, researchers looked at chicken bones found at an archeological site in Chile that were radiocarbon dated to pre-Columbian times (between 1321 and 1407). DNA analysis of those specimens found what scientists thought was a genetic mutation unique to Polynesian chickens which would point to a Pacific origin for the birds only to discover later that the mutation is common in all chickens.

Alice Storey, an archeologist who led the 2007 study, is skeptical of the latest results. She says the new study focuses too much on modern DNA.

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Study: The Chicken Didn't Cross The Pacific To South America