In the course of human history, something wonky happened to the levels of genetic diversity on the X chromosome -- scientists just can't agree on what. Two research teams reported conflicting reports about X chromosome diversity yesterday (Nov. 13) at the __American Society of Human Genetics__ linkurl:meeting; in Philadelphia, with differing interpretations about human mating and migration. Because males only carry one X chromosome, sex-biased evolutionary forces will affect genomic patterns on the X chromosome and on the non-sex chromosomes differently. As such, comparisons of levels of variability between the different chromosomes can be used to test hypotheses about human demographic patterns. linkurl:Alon Keinan,; an evolutionary geneticist at the Harvard Medical School, and his colleagues compared genetic variation on the X chromosome and on the autosomes using a variety of datasets, including over 100,000 linkurl:SNPs; from the linkurl:HapMap project,; and large swaths of sequence data from individuals originating in West...

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