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There's the biological answer and there's the physics answer.

Biologically, yes, it's determined by your genes. Interestingly, the mutation that originally caused blue eyes occurred only about 10,000 years ago. Prior to that, all humans had brown eyes. Everyone who now has blue eyes is a descendant of that one person with the mutation.

The physics answer is that the blue color is caused by Rayleigh scattering. In other words, blue eyes are blue for the same reason that the sky is blue.

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