[Next-Generation Sequencing Book]
  • [Photo] J.W. Bizzaro • July 2, 2001
    ``Four years ago Chinese and Swedish researchers said they had found that marsupials and monotremes [egg-laying mammals] were close relatives.

    ``The evidence came from what is called mitochondrial DNA - genetic material from outside the nucleus of the cell.

    ``Earlier this year, researchers who studied fossilised mammal teeth suggested the opposite was the case - that, many millions of years ago, monotremes evolved in the southern hemisphere, while marsupials and placentals shared a more recent ancestor in the northern hemisphere.

    ``Professor Randy Jirtle and his team at Duke University in North Carolina now say they have analysed evidence from cell-nucleus genes that shows the teeth were telling the truth. And he believes analysis of mitochondrial DNA may not be so reliable in explaining mammalian evolution.''

    Full story:
    http://news.bbc.co.uk/hi/english/sci/tech/newsid_1418000/1418794.stm

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