It can be passed from great grandparents, or grandparents, or some other ancestors. Even hens can have the "Mean Gene", but it's more rare.
I suppose, their mom and sisters sure are/were pushy gals. They like to pinch the backs of my legs when I'm too slow measuring out the feed in the morning--OUCH!
Not sure why threads like this are even made...isnt this a chicken forum shouldn't we all be talking about chickens and nothing else....
We're... literally talking about chickens on the page you posted this?