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
We generally model eye color as a simple trait that follows Mendelian Inheritance, aka brown is dominant so the only way you get blue eyes is if you have two recessive blue genes and no brown gene
In reality though, almost nothing is that simple. It looks like there are currently 15 genes believed to be associated with eye color and some exhibit dominance as you’d expect but others only have incomplete dominance so they may tweak the end value but not override it. You may carry mainly genes for brown eyes but some genes for blue eyes while he carries mainly blue eye genes and some brown that happened to have dominated. Their powered combined its possible to have a kid with only blue eye genes or a mix that presents as pretty much anything from blue to green to brown.
Very very few things are simple Medelian Inheritance, Mendel just got real lucky with his pea pods
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