A 30,000-year-old bison bone plucked from the thawed permafrost inside a Yukon gold mine has helped a team of Australian scientists make a potentially groundbreaking discovery about the way animals adapt to climate change.
A study published in the latest issue of the journal PLoS One describes the Canadian specimen — a bone from the extinct steppe bison, an ancient buffalo that disappeared at the end of the last ice age — as key to unravelling a mystery about how "epigenetic" DNA adjustments can occur more rapidly than full-scale genetic changes in an ecologically stressed species.
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