Exact(2)
In 1972 an academic paper asserted that there was more genetic difference within so-called races than there was between them.
Some insertions contain duplications of segments of DNA, and these duplications contribute more genetic difference than do single base pair substitutions, notes Evan Eichler, of the University of Washington (UW), Seattle, who led a team analyzing the duplications.
Similar(57)
The mouse, though a fellow mammal, last shared a common ancestor with people 100 million years ago, time in which many more genetic differences might have been expected to develop.
"On average there are more genetic differences between any two bushmen in our study than between a European and an Asian," said Webb Miller, a professor of biology at Penn State and co-author of the study.
As more researchers compare wolf and dog DNA, Ostrander expects more genetic differences between dogs and wolves to emerge.
Lounès Chikhi, a geneticist at Paul Sabatier University in Toulouse, France, says he was "very surprised" that the La Braña skeletons had such close genetic affinities with central and eastern European hunter-gatherers, because he would have expected many more genetic differences between them.
This suggests that DNA methylation may contribute more genetic differences between the two lines than transcription.
However, in a whole population of organisms, the exchange of genetic material between pairs of chromosomes tends to be higher when there are more genetic differences present.
Thus boundaries between older species pairs, which have accumulated more genetic differences, will likely exhibit greater genetic incompatibility and be less permeable to gene flow.
Secondly, Europeans and East Asians are in fact genetically similar, whereas more major genetic differences are expected to be found between African and non-African populations (21).
People with axial spondyloarthropathy are a more heterogeneous group and have a higher proportion of women and more marked genetic differences compared with people with classical ankylosing spondylitis.
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