I’ve googled it, but all the answers are telling me is that it’s been way too long since those genetics lessons in middle school
In: 13
Two reasons. Either they offer some benefit, or they cause no harm.
My mom had dark brown eyes. My dad had light brown eyes and siblings with blue or green eyes. I have brown eyes, my wife has green eyes.
We have a kid with brown eyes and one with blue eyes.
So…I inherited brown from my mom, and my dad must have been a carrier for blue and passed that on to me. It was recessive, but did neither me nor my dad any harm. My wife must have blue and green, with blue being recessive. It caused her no harm.
One kid inherited brown from me, which was dominant over whatever my wife gave her. The other must have inherited recessive blue from both of us. It has caused him no harm. His child has blue eyes.
So recessive blue has passed from one of my dad’s parents down to my son and grandson, even though my dad and l had brown eyes, because there was no reason for it to die out – it caused no harm.
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