I have never questioned this and don't see how it would prove anything but inheritance. My niece inherited my BIL's muscular build. So??? My daughter has very blonde hair which, at times, has been in the strawberry blonde spectrum. She is very white but tans beautifully. She has Irish on both sides, etc.. Her aunt has reddish hair with cousins with red hair...and a dad and cousins with blonde hair. What the heck does any of this have to do with but inheritance? (How would it prove anything about evolution but that?) It just sounds to me like something simple is being complicated.