Question

Why does the colour of the iris vary for people?

Answer 1

Answer:

Eye color is determined by variations in a person's genes. Most of the genes associated with eye color are involved in the production, transport, or storage of a pigment called melanin. ... People with brown eyes have a large amount of melanin in the iris, while people with blue eyes have much less of this pigment.

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Answer 2

The iris color is determined by the amount of melanin pigmentation. The more pigment there is, the darker the iris will be. Blue, gray, and green eyes are lighter because there is less melanin inside the iris. ... It's believed up to 10,000 years ago, all humans had brown eyes only.