Eli5: is it possible for a single grandparent to pass on their eye colour to their grandchild?

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Me and my partner both have brown eyes…
My side of the family have all brown eyes so I’m assuming we don’t have the blue eye gene.
My partners parents: his dads side have all brown eyes but his mother and aunts and grandfather have blue eyes. So my husband must be a carrier.
Will my brown eyed genes dominate his blue eye genes or is it possible for a blue eyed baby?
It’s so interesting how it works

In: Biology

10 Answers

Anonymous 0 Comments

Entirely possible. If both you and your husband carry blue eyes genes (which do not show because brown is dominant) they can be passed on to your kid. My brother has blue eyes, for example, and the only other person in the family with blue eyes was my grandpa’s sister. But the genes still run in the family, it is just highly improbable but definitely not impossible to pass only blue eyes genes.

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