In the US, about 90% of the population is right handed. This is a common trend throughout history. This article is a tough read, but is very informative on the history of handedness. How can this be with something so simple as a dominant hand? The numbers are staggering in the right side’s advantage. What causes such a big difference though?
Many believe that it has to do with our brain and genes, but just a quick look at those numbers on this chart seems to suggest that there is something else that may be effecting these numbers. How come the percentage of right handed people is almost 100% in those Asian countries. I decided to ask my roommate, if he knew why this was because he and his family are originally from Vietnam. He explained to me how in there culture people have believed that there is something wrong with left handed people. His mother was originally left handed, but she was made to use her right hand, and now she can write with both hands. This article agrees with his claims, but this can’t account for such a widespread gap. Or can it?
It could be possible that we are genetically made up to more likely be a righty vs. a lefty. How can this be? Is it possible that being left handed is a recessive trait for this gene? This can’t be completely true because that means that, if a left handed person has a kid with another lefty, then their kid must be left handed. Dr. Gupta explains how this isn’t true, and in fact they still would only have a 26% chance of having a left handed child. This isn’t the only proposal that has to deal with genes. Other ideas aren’t quite as simple especially for people not interested in science. Simply put, some researchers believe that we can get 1 of 2 genes. The one gene causes us to be right handed and the other gene causes us to have a 50% chance at being right handed. This could explain the disparity in the number of right handed people vs. left handed people.
The bottom line is that we don’t know why there are so many more right handed people than left handed people. There are many theories to explain it, but they are not proven. I personally believe that it is a combination of these theories that makes such a huge disparity between left handed and right handed people.
Throughout this blog you can see the pattern of most humans being right handed, but in the National Hockey League (NHL) almost two thirds of the league shoots with their left hand. This doesn’t make sense since 90% of the population is right handed. This is because in Canada most coaches teach kids to use their less dominant hand, so they will be able to be a better all around player. Approximately half the NHL is Canadian. Many other countries are starting to adopt this theory too, so we may see these numbers rise.