Since it is a recessive gene, does that mean this single ancestor didn’t have blue eyes…. And that enough of his ancestors interbred that eventually they started having blue eyed babies?
Shush. If you expect them to explain why a single recessive gene carrier could spread the trait to so much of humanity you are in for many hours of mumbo-jumbo created on the fly.
My Dad has deep blue eyes and my Mom dark brown. I have deep blue, one brother has light blue, another brother has hazel, another brother is dark brown and a sister who has green eyes.
My wife has dark brown eyes. My oldest sons are a slate grey, his little brother dark brown and my daughter has deep blue eyes with red hair.
Heck of a Punnett square to work out for eye colors!