People who have one of several well-documented medical conditions do not have only XX or XY chromosomes, which typically correspond with female and male sexes, respectively. Those conditions include ...

A recent Trump executive order defines sex based on gamete size. But the order oversimplifies genetics, hormones and reproductive biology.

Researchers at Tel Aviv University, led by Prof. Illana Gozes, examined the effects of different mutations in the ADNP protein, which is essential for normal brain development and aging, on the brain ...