What determines if you are left-handed or right-handed?

 What determines if you are left-handed or right-handed?

Scientists aren’t entirely sure, although they’re pretty sure it’s genetic. A long-held theory has been that handedness is determined by gene expression in the left or right hemisphere. However, recent research suggests that early asymmetry in the spinal cord, even before the motor cortex is developed, is actually the cause of right- or left-handedness.

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