The supposedly “female” chromosome may have a very male role after all: mediating male infertility and sperm production. The X is also much more rapidly evolving that previously believed, according to research published this week. The researchers came to these conclusions after re-sequencing the existing human X chromosome assembly and comparing it with the X of the mouse, which revealed that while certain regions were highly genetically similar, many others were not shared—a finding that challenged the long held dogma that X-linked genes vary little among mammals.
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