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
Yes! This concept can be explained using a simple method called [Punnet squares](https://genetics.thetech.org/ask/ask59).
In genetics, a person with blue eyes has a “bb” genetic code. A person with brown eyes has a “BB” genetic code. So what happens when a “BB” and a “bb” have a baby? The baby gets a “Bb” genetic code, taking one letter from each.
That baby will have brown eyes… *but* that little b does do something. It gives the possibility of a blue-eyed baby!
Let’s say a brown-eyed person with a Bb code and a blue-eyed person with a bb code have a baby. What are the possible outcomes? A Bb (brown-eyed) or a bb (blue-eyed)!
The same could happen if a brown-eyed person with a Bb code has a baby with a brown-eyed person with a Bb code. The baby happens to inherit a b from each parent. Now it’s a bb… blue-eyed baby!
Both parents have brown eyes. Where did this blue-eyed baby come from? From the little b each parent carried.
One important note: Most babies have blue eyes at birth, but they can darken naturally over time. So if you have a blue-eyed baby at birth, it can take a few months, or even a couple years, before you know the true color.
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