All mysteries
Mystery #1Tier 2genetics inheritance eyes

How can two brown-eyed parents end up with a blue-eyed baby?

Two brown-eyed parents look down at their newborn and see bright blue eyes staring back. Nobody swapped the baby, and their own parents have brown eyes too. So where on earth did the blue come from?

An extreme close-up of a human iris, grey-green with a ring of orange flecks around the pupil, showing that real eye colour is rarely simply brown or blue.
Photo: Matt Ming · CC BY 2.0 · via Wikimedia Commons

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