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Their analysis showed that females and males younger than 50 with the variant do not show the typical sex-linked differences in blood pressure.

The estimate includes people with extra or missing sex-linked chromosomes, and those born with other physical variations that don’t fit into categories of “male” or “female.”

This pattern suggested to the researchers a sex-linked genetic origin for what they were seeing.

Hemophilia—like white eyes in fruit flies—is a sex-linked genetic illness.

Because of their different, sex-linked biology, women get there differently from men, including in some aspects of the way the game itself is played.