How Mendel's pea plants helped us understand genetics

Each father and mother pass down traits to their children, who inherit combinations of their dominant or recessive alleles. But how do we know so much about genetics today? Hortensia Jiménez Díaz explains how studying pea plants revealed why you may have blue eyes. [Directed by Johan Sonestedt and Veronica Wallenberg, narrated by Rose Eveleth].