Everyone has genes. They are instructions for your body. Genes determine what your body looks like, what color hair and eyes you have, and more. your genes live in your DNA - long strands of information that make your body work. your DNA is unique, Which means no one else has the same DNA as you. One strand of DNA makes up a chromosome. Most humans have 23 pairs of chromosomes(46 total) in every cell in their body. We inherit chromosomes from our parents: we usually get 23 from dad and 23 from mom