Uploaded by NationalGeographic on Dec 12, 2011
National Geographic Explorer Beth Shapiro describes the common ancestry of polar bears and brown bears.
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Irish brown bears from the Ice Age period between 10,000 and 38,000 years ago had the maternal DNA that is now seen in every polar bear.Older pre-Ice Age brown bears, dating to between 43,000 and 38,000 years, had a different genetic signature matching that of modern bears from Eastern Europe. Remains of the last ancient brown bears in Ireland, from 3,000 to 5,000 years ago, had yet another genetic fingerprint seen in modern western European bears.
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Modern polar bears share a distinct DNA sequence, passed down the female line, with their now-extinct brown ancestors.Modern polar bears share a distinct DNA sequence, passed down the female line, with their now-extinct brown ancestors.Polar bears may have moved into what is now Ireland when the region was experiencing much cooler temperatures than it is today. At the same time, brown bears may have been pushed towards the coast by advancing ice sheets.
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I am irish therefore i am a polar bear
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@BrowseMyChannel ha ha ha u just made me spit my beer all over my laptop v funny!
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how more awesome can we get
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yeah
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Yummm sarah palin
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Well its near bloody cold enough here anyways for the polar bears to live here in Ireland!
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Did you see in the news, recently, in the last couple of years.
nope.jpg
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the bottom line is to protect the polar bears from extinction..
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@22CaliberHitters
read up buddy, they are on the decline
killtastraphe 2 months ago in playlist More videos from NationalGeographic 4
@22CaliberHitters source please; otherwise I'd call bullshit
pudgeypigeon 2 months ago 3