Chromosomes, biological sex and gender

Human genetics – sexual reproduction, chromosomes, how it works; genes, what can go wrong. Sexual development, disorders and gender identity! Masses of information, some guaranteed surprises, pictures, videos and loads of links. Clue yourself in.

Biological sex differences: bones & muscles

Biological sex affects every part of us, down to the cellular level. The internet’s full of misinformed nonsense – and, worryingly, even medical science doesn’t know the half of it. Real physical differences between women and men are too far-reaching to cover in depth but I’ll try to be comprehensive. Part 1: structure. Skeleton, head, muscles.