Science is an asshole.... A cool asshole

Then that carrier will have brown eyes since it is the dominant gene

But what if he's Bb and She's Bb.

But, if the genes were both dominant and only one parent had the recessive gene it would be impossible for them to have offspring with blue eyes. And even if they both had the recessive gene, there would only be a 20% chance of having a homozygous recessive. Which is the only way he could have blue eyes.

Dude, what the fuck.