Dominant Hand

There is a shift in the world away from using pen and paper for everything in the world, however, it is something that all children are taught how to do. One thing that has always seemed strange to me is the fact that there are different dominant hands within humans, and beyond that, the number of people with each dominant hand is not an even (or at least evenish) divide. So why is it that we have dominant hands and why is being left-handed less common than right? 

In Western Countries, around ten to fifteen percent of individuals are left-handed, with the other section being right-handed. It is uncommon to be ambidextrous or even to use different hands more strongly for different tasks, though it is not an unheard-of thing. The development of handedness becomes apparent in the developmental stage of childhood, with children showing dominance with a specific hand that continues with them throughout their life. The developmental stage is when the brain differentiates the different sides of the body, the left, and right. The occurrence of handedness seems to come from the development of the two hemispheres of the brain, with the right hemisphere controlling the left side of the body, and the left controls the right. While both hemispheres of the brain work together for function, it is a cross-wired system that works that way. There are many studies that suggest that handedness is genetic and could be dictated by a large number of genes that we inherit. So with this in mind, it is likely that left handedness is a recessive gene. 

There are many questions about the unevenness of human characteristics that can be answered through the examination of human genes. It is strange to think so much of us is determined before we breathe our first breath.


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