Male and female reproductive systems allow human reproduction. Fertilisation occurs when a sperm and egg join to form an embryo. An embryo develops into an unborn baby in the uterus during pregnancy.

The ability to create egg cells from human skin represents one of the most extraordinary frontiers in reproductive science. Researchers are exploring how to reprogramme ordinary body cells into viable ...

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 ...