What do HOX genes do?
They control what atomic structures develop where in the body of humans.
HOX genes is the term for homeobox genes (sometimes called homeotic genes) in humans. These homeobox genes are a group of very conserved genes among organisms as well as plants.
The HOX genes determine the basic body plan of humans during development. It determines the axes (front-back, top-bottom) and what anatomical structures grow where.
You can read more information about the function of HOX genes in the answers to the following questions on this website: