The startup sportswear brand XX-XY Athletics, founded by former U.S. gymnast and Levi's executive Jennifer Sey, crossed seven figures in profit in its first 10 months in 2024, she told FOX ...

Physical gender is not always just a matter of XX or XY, girl or boy. In approximately one out of every 100 births, seemingly tiny errors occur during the various stages of fetal sex ...

"You either have XX or XY chromosomes," Rep. Nancy Mace, R-S.C., wrote Feb. 20 on X. "Those are the options." Most commonly, a person is born with two X chromosomes (female) or an X and a Y (male).

21 email, "Barring chromosomal abnormalities, a person with a typical number of chromosomes — known as a euploid — has either XX or XY which determines biological sex." About 1.7% of the ...