From: Josh Bembenek (jbembe@hotmail.com)
Date: Mon Apr 28 2003 - 16:11:00 EDT
In the interest of being open-minded about the common descent issue, here is
a considerably problematic article for the idea that man did not descend
from monkeys. I can find no alternate explanation, nor have I critically
analyzed the data. Any comments?
"Chromosomal Speciation and Molecular Divergence- Accelerated Evolution in
Rearranged Chromosomes." Navarro, A. and Barton NH. Science 300, p321-324.
Abstract:
Humans and their closest evolutionary relatives, the chimpanzees, differ in
~1.24% of their genomic DNA sequences. The fraction of these changes
accumulated during the speciation processes that have separated the two
lineages may be of special relevance in understanding the basis of their
differences. We analyzed human and chimpanzee sequence data to search for
the patterns of divergence and polymorphism predicted by a theoretical model
of speciation. According to the model, positively selected changes should
accumulate in chromosomes that present fixed structural differences, such as
inversions, between the two species. Protein evolution was more than 2.2
times faster in chromosomes that had undergone structural rearrangements
compared with colinear chromosomes. Also, nucleotide variability is slightly
lower in rearranged chromosomes. These patterns of divergence and
polymorphism may be, at least in part, the molecular footprint of speciation
events in the human and chimpanzee lineages.
Josh
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