An international study has identified more than 50 genes on the X chromosome in which mutations may cause poor sperm production. Nearly half of all men with low or zero sperm count have no medical ...

X-chromosome inactivation varies across different areas of brains. Here, fluorescent imaging data from a mouse reveal where the father’s X chromosome is most active (white) and least active (blue). A ...

Chris Kaelin, a geneticist at Stanford Medicine, recently solved the riddle of why so many orange cats are male. In a groundbreaking study, Kaelin and his team discovered a unique mutation that ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." The 23 rd chromosome base pair contains what are known as our sex chromosomes. For most females, this ...