Lost in the sea of genes

Article Abstract:

Researchers at the Sanger Centre in Cambridge, England, have been looking at introns, the apparently meaningless intervening sequences between the recognizable parts of genes. It has been found that puffer fish have as many introns as humans, and that the position of these introns is very similar to that of introns in humans. This indicates that introns have not been lost gradually over the 450 million years since the death of the last common ancestor of humans and puffer fish, even though they have no obvious biological purpose. It is therefore possible that introns do have an evolutionary role.

Introns

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African connection

Article Abstract:

There is still considerable debate about whether all modern humans originated in Africa. Some observers believe that modern humans evolved at slightly different times and places over the past 250,000 years, even though they probably had pre-modern African ancestors around 2 million years ago. This view is held by US palaeontologist Milford Wolpoff, who has developed a model of multi-regional evolution. He is opposed by Chris Stringer of the Natural History Museum in London, England, who believes that modern humans evolved relatively recently from a single African origin.

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Lost in the myths of time

Article Abstract:

Research apparently indicating that ancient DNA had been found in the 60,000-year-old Mungo skeleton from Australia received extensive media coverage in Jan 2001. In contrast, there was little coverage of the fact that the authors of the research conceded that their results did not really overturn the theory that the human species had a recent African origin.

DNA

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