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Fears men could eventually 'die out' as Y chromosome is vanishing over time

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monkeys diverged 25 million years ago. But losing the Y chromosome completely is still a possibility, as it's happened to other species including underground rodents called mole voles, as well as certain species of spiny rats in Japan.This doesn't necessarily mean that men are doomed, as the loss of the Y chromosome doesn't erase the male sex from a species as both spiny rats and mole voles still have males and females."People think that sex is sort of a very determined thing," said Rasmus Nielsen, a geneticist at the University of California, Berkeley."That if you have a Y chromosome, then you're a man, or you don't have [a] Y chromosome, then you're female.

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