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Monday, November 10, 2008

We are 98 percent chimpanzee? Scratch that.

Here are some more realistic stats from Brit expert Richard Buggs:
Looking closely at the chimpanzee-like 76% of the human genome, we find that to make an exact alignment, we often have to introduce artificial gaps in either the human or the chimp genome. These gaps give another 3% difference. So now we have a 73% similarity between the two genomes.

In the neatly aligned sequences we now find another form of difference, where a single ’letter’ is different between the human and chimp genomes. These provide another 1.23% difference between the two genomes. Thus, the percentage difference is now at around 72%.

We also find places where two pieces of human genome align with only one piece of chimp genome, or two pieces of chimp genome align with one piece of human genome. This ”copy number variation” causes another 2.7% difference between the two species. Therefore the total similarity of the genomes could be below 70%.

This figure does not take include differences in the organization of the two genomes. At present we cannot fully assess the difference in structure of the two genomes, because the human genome was used as a template (or ”scaffold”) when the chimpanzee draft genome was assembled.
Hey, if you like bananas, that's fine, but you are still far more closely related to Ronald Reagan than to Bonzo (whatever you may think about that).

Find out why there is an intelligent design controversy:

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