Never write off a rank outsider. A female mammal that carries a “male” chromosome should struggle to reproduce, but not if that animal is an African pygmy mouse. For females of this species, a male chromosome spells reproductive supremacy. Image: Ian N. White
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Humanity’s dramatic race across the Old World after it left its African cradle has been told countless times. But for a true sense of the rapidity of events, look no further than the Y chromosome. The most comprehensive analysis of the Y yet shows that three key human groups appeared within just 150 years. Image: shabzillaa
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Albert Perry carried a secret in his DNA: a Y chromosome so distinctive that it reveals new information about the origin of our species. It shows that the last common male ancestor down the paternal line of our species is over twice as old as we thought, and might provide more evidence that modern humans interbred with archaic forms. Image: dctim1
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