Genetics

Lately a few thing got me wondering. I know kids inherit their parents or family genes. That is hair color, eyes, nose and so on. But can they also inherit mannerisms. I ask this because both my kids portray something from my parents, their grandparents. Lil Ricky whenever he's concentrating and hard at work he sticks his tongue out. My mom does this. Hana on the other hand twirls her hair and it drives me crazy because it knots up. Sometimes to the point where we just have to cut it. I remember as a child always seeing my dad, her grandpa doing this.
So this brings me back to the question are mannerisms inherited? The human mind is such a complex and incredible machine. It just makes me wonder what is learned and what is inherited.