Thomas Hunt Morgan and fruit flies

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/science/ap-biology/heredity/non-mendelian-genetics/v/thomas-hunt-morgan-and-fruit-flies Thomas Hunt Morgan's pioneering work that established the connection with sex and eye color in fruit flies (and thus helped validate the chromosomal theory of inheritance).