Genes are made of DNA.
Eye color
Where do traits, such as eye color and shape, come from? Why do you look more like your relatives than other people? The parts of your cells that determine these traits are called genes.

In the past, no one knew what genes were. In the 20th century, scientists figured out that they were actually made of DNA.

Genes come in pairs. You get half of your genes from your mother, and the other half from your father.