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In one 2024 study published in Communications Biology, Mason found that astronauts who spent time in space had longer telomeres, or structures at the end of chromosomes which protect DNA.

Years after the discovery of her uterus, Annalise learned she was born with a mix of both XX and XY chromosomes.

Dr Upton told the tribunal that Ms Peggie had also "asked me what my chromosomes were" and that other staff members were also uncomfortable with the doctor using the female changing room.

By contrast, there was a lot of diversity in the Y chromosomes, which is passed from father to son, indicating that men from lots of different families married into the community.

The USDA-Texas A&M Department of Entomology study identified chromosomes that determine whether ticks develop as male or female.