A gene is a set of instructions inside your cells that helps determine specific traits about you, like your eye color, hair texture, or how tall you might grow. Genes are made of a chemical called DNA, and you inherit them from your parents: half from your mother and half from your father, which is why you might have your dad's nose or your mom's curly hair.

Think of genes as recipes in a cookbook. Just as a recipe tells you exactly how to make chocolate chip cookies, a gene tells your body how to make a specific protein or help control a particular characteristic. Your body contains thousands of different genes, each responsible for different jobs. Some genes determine physical features you can see, while others control things you can't see, like how your body processes food or fights off illness.

Scientists study genes to understand why people look different from each other, why certain diseases run in families, and how living things pass traits to their offspring. The field of genetics (the study of genes) has helped doctors treat diseases, farmers grow better crops, and researchers understand how all life on Earth is connected. When scientists talk about genetic traits, they mean characteristics that are inherited through genes rather than learned or chosen.