Sperm warfare: why male ones are faster and what this means for ...

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Sperm warfare: why male ones are faster and what this means for humanity

New research means we could soon be able to choose the sex of our babies. But do we really want to?

Sarah Knapton

Sperm can be segregated easily into male and female, scientists have shown for the first time, in a breakthrough that experts said could have “disruptive social consequences” if applied to humans.

Japanese researchers discovered that sperm bearing the “X” chromosome – which generates a female when it joins with the X chromosome of an egg – carry molecules that when activated slow down its movement.

When a chemical to trigger those receptors is added to sperm, the male “Y” chromosomes power ahead, separating themselves from the tardy Xs...

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