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Is the way a person laughs and his voice a part of their genetics?

I am curious about genetics and figured I try to put two questions into one. If not what factors change a persons laugh? What changes his voice tone & pitch?

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Genetics dictate how your vocal cords are when you are born, but from there on out, environmental factors also need to be taken into consideration. Whether or not you were exposed to cigarette smoke and other environmental hazards will have an effect on your voice. Laughter, being part of your voice, is no different. But you can change your voice and even your laughter to a certain extent. I used to hate my laugh, but loved laughing, so I "worked" on my laugh until I found it acceptable. Now everyone tells me how much they love my laugh and my voice.

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Not entirely. You can change your voice, exercise it, and manipulate it. That's why actors take voice lessons.

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Your genetics can determine the size of your vocal chord, but other things can effect it as well. I had surgery and the way the tube rested on my vocal chord temporarily paralyzed it. I squeaked for about 3 months.

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