In a nutshell (or in this case, a nucleus), our DNA – Deoxyribonucleic Acid - is the set of genetic instructions for creating a person.

Inside each of our cells are chromosomes, which carry hereditary information in long strings of DNA called genes. Humans have 22 pairs of chromosomes plus a single pair of sex chromosomes that determines gender: XX female, XY male. Each of these chromosomal pairs is a combination of genes inherited from the father and mother.

DNA molecules are shaped like a spiral staircase called a double helix. As a blueprint for production, DNA dictates cellular function and our physical characteristics, such as hair color, height, eye color, and skin tone.