The sex we're assigned at birth depends largely on a genetic flip of the coin: X or Y? Two X chromosomes and you (almost always) develop ovaries. An X and a Y chromosome? Testes. These packages of ...

Chromosomes are tightly coiled structures in each of your cells that contain DNA, the code for all life. DNA is organized in segments on chromosomes called genes. Humans typically have 46 chromosomes ...

Two studies now shed light on how chromosomes that undergo catastrophic shattering are transmitted to daughter cells during cell division, thereby enabling them to be reassembled for the benefit of ...