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Horsetalk.co.nz Gene flow between Eurasian and North American horses revealed by ancient DNA Share Ancient horses crossed over the Bering Land Bridge in both directions between North America and Asia multiple times during the Pleistocene. Image: Julius Csotonyi Analysis of ancient horse DNA reveals the gene flow between horse populations in North America, where they evolved, and Eurasia, where they were domesticated. The study of DNA from horse fossils shows that horse populations on the two continents remained connected through the Bering Land Bridge, moving back and forth and interbreeding multiple times over hundreds of thousands of years. ....
Cave bears were giant plant eating bears that roamed Europe and northern Asia, and went extinct around 25 thousand years ago. They hibernated in caves during the winter. This was a dangerous time, as those which had failed to fatten up enough during the summer would not survive hibernation. As a result, many caves across Europe and northern Asia are now filled with the bones of cave bears, each one containing potentially thousands of individuals. In our new study, we analysed a bone from a cave in the Caucasus Mountains. Our team recovered the genome from a 360,000-year-old cave bear, revealing new details of the animals’ evolutionary history and almost rewriting their entire evolutionary tree. As well as what it can tell us about cave bear evolution, this discovery is a breakthrough for the field of ancient DNA. ....
L'ADN d'un ours des cavernes toujours lisible après 360 000 ans sciencepost.fr - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from sciencepost.fr Daily Mail and Mail on Sunday newspapers.
An Extinct Cave Bear s DNA Was Still Readable After 360,000 Years Image: Gennady Baryshnikov A tiny ear bone belonging to a cave bear that died some 360,000 years ago has yielded the oldest genome not sourced from permafrost. The newly sequenced genome is offering new insights into the evolution of cave bears and how climate change can precipitate the emergence of entirely new species. Advertisement “With DNA, we can decipher the genetic code of extinct animals long after they’ve gone, but over thousands of years, the DNA present in ancient samples slowly disappears, creating a time limit of how far back in time you can normally go,” Axel Barlow, the first author of the new study and paleogeneticist from Nottingham Trent University, said in a statement. ....
Изменился порядок приёма первоклассников в псковские школы informpskov.ru - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from informpskov.ru Daily Mail and Mail on Sunday newspapers.