Why the Y chromosome is disappearing and what this means for our species' future

The male gene could be close to extinction

Illustration of human chromosomes, a DNA helix, and genetic data
There is also the possibility that humans will develop an entirely new sex gene
(Image credit: Illustration by Stephen Kelly / Getty Images)

Human biological sex is determined by the sex chromosomes X and Y. In most cases, females possess two X chromosomes, while males have one X and one Y. However, there is some evidence that the Y chromosome is being phased out of the evolutionary pipeline, and could one day disappear altogether — potentially giving rise to a new sex gene in the process.

Why is the Y chromosome disappearing?

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Devika Rao, The Week US

 Devika Rao has worked as a staff writer at The Week since 2022, covering science, the environment, climate and business. She previously worked as a policy associate for a nonprofit organization advocating for environmental action from a business perspective.