The story of a rare Calico Cat, Josie, has gone viral on TikTok after user @xxycalico shared it on the platform with a video montage of the feline. While the adoption story of Josie is heart-warming, ...

Researchers have uncovered which genes on the Y chromosome regulate the development of sperm and impact fertility in male mice. This research could help us understand why some men don't produce enough ...

It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...