Understanding" incomplete dominants" will change your view on how race should be defined in USA. Rather than a one-drop rule approach that says people are either white or nonwhite, you see three categories instead.
>White >Part-white >Non-white Which coincides with each trait being >Recessive >Incomplete dominant >Dominant
It's possible for traits to go from "dominant" to "recessive" through generations. Online, trolls say blue-eye people are incestuous but in reality the gene spreads around the population and goes through some generations of "diversify" before reappearing. I'd say all recessive traits are like this, including white skin
Look at the last line, it's a 25% chance. Your friend got lucky but if he ever has a kid with someone with brown eyes, the kid will have brown eyes because of his recessive alleles (bb). He has to find someone with blue eyes.
