These Little Creatures Have The ‘Weirdest Sex Chromosome System Known to Science’ – ScienceAlert

When it comes to dividing animals along sex lines, evolution is known for getting creative. The chromosomes that determine baby-making functions have been reinvented so often throughout the ages, it’s hard to keep track.
Some groups, like mammals, are thought to be fairly consistent in how they genetically cast lots in the game of reproduction. But creeping voles (Microtus oregoni) clearly didn’t get that memo.
Now, US researchers have a better idea of just what’s going on with the tiny oddball.
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