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Scientists who study the divergence of humans from the other great apes have been stymied by a lack of evidence.
On the basis of his observations of the shape of the jaw and of the morphology of the teeth which he thought were transitional between those of apes and humans Simons advanced the theory that Ramapithecus represented the first step in the evolutionary divergence of humans from the common hominoid stock that produced modern apes and humans.
We caution that this is only a rough estimate because of the uncertainty about the time of divergence of humans and chimpanzees.
The positions of these deeper branch points (nodes) were used to calculate times for the divergence of humans from macaque, orangutan, gorilla and chimpanzee.
This split time seemed to corroborate the molecular divergence of humans and chimpanzee at 5 7 million years [28] and the divergence age between the human and chimpanzee mitochondrial genomes at 6 million years [29].
However, it is unlikely that background purifying selection started to act on a large non-coding region only at a certain point during the last 20 25 MY, after the divergence of humans and rhesus lineages.
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Miller, J. A., Horvath, S. & Geschwind, D. H. Divergence of human and mouse brain transcriptome highlights Alzheimer disease pathways.
We contrast these patterns of polymorphism with insertions and deletions fixed in the same regions since the divergence of human and chimpanzee (n = 10546).
This, however, would yield a divergence date of 4.6 (SD 0.18) million years (my), which is at odds with paleontological findings that place the divergence of human lineage at least at 6 my ago [39].
Since the divergence of human and chimpanzee lineages, these elements have vigorously created chromosomal rearrangements causing genomic difference between humans and chimpanzees by either increasing or decreasing the size of genome.
Here we assume that divergence of human-chimpanzee, human-orangutan, and human-macaque takes approximately some 6, 13, and 23 million years, respectively [60], and that average generations in human, chimpanzee, orangutan, and macaque are 28, 22, 20, and 11.4 years, respectively [61], [62].
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