Gray and green eye colors are the rarest in the world. Eye color is determined by the amount of melanin in the iris, with more melanin making eyes darker. A genetic mutation 10,000 years ago caused ...

When it comes to dogs, you've probably noticed that most of them have brown eyes, which is why meeting one sporting a different shade really makes them stand out. While you've probably seen a few pups ...

Eye color genetics is complex, with multiple genes from each parent determining a person's eye color. Scientists once believed a single gene controlled eye color, but research shows that more than 50 ...