Sex determination at birth is decided on the chromosomes the baby has. A female has two X chromosomes, whereas a male has one X and one Y chromosome. According to Medline Plus, in every cell, humans ...

Political outrage surrounding two women competing in boxing at the Paris Olympics stems from "a lot of misinformation," an International Olympics Committee spokesperson said Friday. It all began when ...

Each human cell contains 23 pairs of chromosomes that carry DNA within their nucleus. The X and Y chromosomes, commonly referred to as the sex chromosomes, are one such pair. They determine the ...

Doctors discovered a woman had "blood chimerism" after examining the chromosomes of cells from different parts of her body.