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In 2002, evolutionary biologist Jenny Graves revealed a provocative calculation in regard to the human Y chromosome, later mentioning that it "is running out of time." Over the past 300 million years, ...

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For any mammal, the loss of the Y chromosome should mean the loss of males and the demise of the species. So how the Amami spiny rat manages without a Y chromosome has puzzled biologists for decades.

For many years, the human Y chromosome was terra incognita. Scientists completed the genetic sequences of other chromosomes, the threadlike structures that hold an organism’s DNA. But more than 50 ...