Whether a person is right-handed or left-handed can be said to be governed by both genetics and environmental factors. Most of the people are commonly right-handed. There are very few cases of left-handed people or those who are ambidextrous (ability to use either hands to perform different tasks) in nature. Handedness seems to be determined by the right and left hemispheres of the brain. The right hemisphere controls movement on the left side of the body and vice-versa. This trait is usually developed during the early childhood and remains steadfast throughout life.
A gene variant is a permanent change/alteration in