I know that being red headed itself is a mutation of the MC1R gene on the 16th chromosome, and unlike being blonde with blue eyes, eye color and hair color (in the case of red hair) are not linked. Blonde hair and blue eyes are both on the 15th chromosome which is why they are linked. Being a red head, I know several with blue eyes, one with green, and tons with hazel eyes. But I am the only one I've ever met with dark brown eyes. They're so dark they show up almost black in pictures. No one on either side of my family has brown eyes. So what gives?