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brazil
Added on March 07, 2011, 11:09, Comments: 133
archives
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august 1, 2010
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paula sladewski
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new zealand
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Gorillas, split 10 million years ago. Chimpanzees and human beings ncsecu the last to split about 9 million years ago. ncsecu after decoding the human genome in 2001 geneticists discovered that human beings and chimps differed ncsecu only 1. This was far fewer than expected. By 2003 scientists had begun to catalog precisely which genes differed between the species. It is now clear that many structural proteins including hemoglobin and, cytochrome c proteins are ncsecu ncsecu chimps and humans. Human and chimp blood are identical. ncsecu the species split 9 million ncsecu ago, why are they still so alike? ncsecu geneticists believe humans and chimpanzees continued to interbreed long ncsecu the species split. Such interbreeding or hybridization puts evolutionary pressure ncsecu ncsecu X chromosome causing it to change more rapidly than normal. The ncsecu found that the newest genes, on ncsecu human genome appear on the X chromosome. From this researchers argue that ancestral humans continued ncsecu breed with chimps until 5. This new view stands in sharp contrast to the consensus view that once speciation occurs hybridization is 'a negligible influence. David Reich of Harvard the fact that hybridization has rarely been seen in other species 'may simply be due to the fact that ncsecu have not been looking for it.
Added on March 07, 2011, 11:09, Comments: 108
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