We know surprisingly little about how natural selection and thousands of years of selective breeding by humans have shaped these animals on the genetic scale. In doing so, it redefines how far back in time scientists can travel using DNA sequences as their guide.Įvery time a cowboy throws a leg over the saddle and gallops off on his horse, he's riding on top of 4 million years of evolutionary history. The work rewrites the evolutionary history of the horse and smashes the previous record for the oldest complete genome ever sequenced. By piecing together the genetic information locked inside a frozen, fossilized bone, scientists have deciphered the complete genome of an extinct prehistoric horse that roamed the Yukon more than 700,000 years ago.
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