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formed distinct groups before then, cheap air jordans , probably between about 6, cheap jordans for sale ,400 to 14,000 years ago. The finding suggests that dogs may have been domesticated from local wolves in two separate locations during the Stone Age. The ancient dog’s DNA may also help pinpoint when domestication happened. Using the Newgrange dog as a calibrator and the modern dogs to determine how much dogs have changed genetically in the past 4,800 years, Frantz and colleagues determined that dogs’ mutation rate is slower than researchers have previously calculated. Then, cheap jordan shoes , using the slower mutation rate to calculate when dogs became distinct from wolves, the researchers found that separate branches of the canine family tree formed between 20,000 and 60,000 years ago. Many previous calculations put the split between about 13, cheap jordans online ,000 and about 30,000 years ago, cheap real jordans , but the new dates are consistent with figures from a study of an ancient wolf’s DNA (SN: 6/13/15, p. 10). Frantz and colleagues emphasize that their estimate doesn’t necessarily pinpoint the time of domestication. It could indicate that different populations of wolves were evolving into new species at that time, cheap jordans . One of those could later have evolved into the ancestor of dogs, cheap retro jordans . Shift in dogs’ genetic makeup The proportion mitochondria types that European dogs carry has changed over time. Mitochondria are energy-producing organelles in cells inherited from the mother, cheap jordans free shipping . Ancient dogs from Europe and the Middle East once carried http://www.midwestartfairs.com/node/add/article http://www.regards-publicite.com/ http://airesearch.com/...85103.msg185209#msg185209 |