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L'archéologie de l'Afrique de l'Ouest pourrait écrire autrement les manuels sur l'évolution humaine theconversation.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from theconversation.com Daily Mail and Mail on Sunday newspapers.
The oldest modern human genome has been identified in a woman who lived in the Czech Republic about 45,000 years ago. Incredibly, when her remains were found back in 1950, it was believed that she was only about 15,000 years old. What’s even more interesting is that the woman’s genome revealed that her not-so-distant ancestors had relations with Neanderthals. Researchers found human remains in caves located in the Czech Republic and Bulgaria. Three of the individuals were found in the Bacho Kiro Cave in Bulgaria while one woman’s remains were found in a Czech cave. All four people were alive about 45,000 years ago and had Neanderthal DNA. ....
Seabiscuit was not an impressive-looking horse. He was considered quite lazy, preferring to eat and sleep in his stall rather than exercise. He’d been written off by most of the racing industry after losing his first 17 races. But Seabiscuit eventually became one of the most beloved thoroughbred champions of all time – voted 1938 Horse of the Year after winning his legendary match race as an underdog against Triple Crown winner War Admiral in 1938. As a molecular physiologist, the concept of understanding how specific gene variants can affect performance, whether in athletics, learning or even how an organism develops, has always intrigued me. Thoroughbred racing seemed a promising arena to study this idea, since successful racehorses need not only elite physical attributes, but also the mental makeup of a champion, sometimes referred to as the “will to win.” ....
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. ....
Just days ago, I wrote an article about how the world’s oldest DNA was recovered from mammoths that lived more than a million years ago. The DNA was collected from three ancient mammoths that were preserved in the Siberian permafrost. And now, new research has revealed that the oldest DNA from an animal not preserved in permafrost has been extracted from an ancient cave bear. The DNA was extracted from a large and vegetarian 360,000-year-old cave bear that lived in what is now Georgia during the Middle Pleistocene Period. The cave bears’ scientific name is Ursus kudarensis praekudarensis and they were known to hibernate in caves during the winter months. They weighed as much as a tonne (over double the size of a male polar bear) despite only eating plants and since they had a hard time storing fat away for their hibernation periods, they occasionally died during the winter months. ....