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Because they have at least one ancestor with blue eyes. The first person with blue eyes had a genetic mutation, and that mutation was passed on.

EXAMPLE: My fifth grade teacher had bright, sparkling blue eyes. Her granddaughter did, too. Neither of her granddaughter's parents had blue eyes, and her son-in-law's family didn't have blue eyes, as far as anyone knew.

because blue eyes have the least pigment

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14y ago

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