Pick up any child development book (like any college book) and it will tell you that whatever side you lie on in the womb determines if you are left or right handed. And it makes perfect sense, too. If you are lying on your left (as many obviously do) your right arm is free to move and start developing motor skills. And if you lie on the right, you have to use your left arm to move all about. And there is really nothing you can to about it. That's why natural selection hasn't just "threaded" them out, because there has been no way to. Just because your parent's are both lefties dosen't mean you will be, because you prob won't.
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Pick up any child development book (like any college book) and it will tell you that whatever side you lie on in the womb determines if you are left or right handed. And it makes perfect sense, too. If you are lying on your left (as many obviously do) your right arm is free to move and start developing motor skills. And if you lie on the right, you have to use your left arm to move all about. And there is really nothing you can to about it. That's why natural selection hasn't just "threaded" them out, because there has been no way to. Just because your parent's are both lefties dosen't mean you will be, because you prob won't.