What determines your right hand? The answer is not everyone knows

Scientists have shown that not only the brain, this part plays an important role in determining your right.

We know that around 90% of people in the world are right-handed. Left-handed, right-handed . the story is not so new but to talk about this is also interesting.

If someone asks you, what do you know about genetics of left or right handed, or even two hands, would you say? And how this helps shape our understanding of biology in general. Let's find the answer.

What is handedness?

The trouble is - determining the dominant hand is not a simple thing. Your priority to use your hand to write is the sum of at least three things: genetics, environment and potentially random.

Why is the environment? Remember the stories that girls teach their children to knock on, those who write or draw with their left hand.

Former US President Barack Obama is left-handed.

In many cultures, the left involves evil. This has, is, and will probably continue to affect those who want to keep their left hand as the dominant hand.

Less violent, but equally effective, try using normal scissors with your left hand. No, right?

The fact is that scissors and other hand tools such as desserts, hand saws, are designed for a large number of right-handed people, meaning that left-handed people will be more difficult to use, which makes these Left-handed people are likely to use their right hand.

What is it really?

The above disadvantages make many studies determine the dominant hand based on the hand used to write. And they may have mistakenly identified a significant population.

One solution accepted by many researchers is to conduct a series of surveys. There are many actions that can show your dominant hand such as sewing or using a fork.

In many cultures, the left involves evil.

Researchers can classify people into three groups - right-handed, left-handed or ambidextrous - either two-handed, right-handed and non-right-handed.

Genetics certainly plays a role, but what role? Is there a type of gene that regulates you? The dominant hand, then, can be a function of this genotype, and its interaction with the environment and random opportunities.

In addition, there are many examples of left and right asymmetries in the human body. Perhaps the most striking is the asymmetric composition of organs - heart, lungs and gastrointestinal tract.

But what has a central role in understanding the genetic nature of the right hand is the hair swirl . Like whirlwinds, the hair on our scalp forms a central spiral with a forward or reverse rotation direction.

The dominant hand and the hair spin are related.

Its spiral and direction are at the heart of a genetic study of the dominant hand. Amar Klar - a scientist who secretly recorded the direction of the whirlpool of shoppers at a local center.

Klar concludes that, right-handed and clockwise hair vortex are related to each other. After that, he directly surveyed a smaller group of people with anticlockwise hair swirls and found that the group had a right-handed tendency equal to the left-handed trend.

In this way, Klar shows that the right hand and the curl of the hair are related to each other , but not the "right-handed who has swirled clockwise hair and vice versa".

A single gene that decides the right hand?

Klar proposed a research model and discovered that there was a single gene that helped determine both the dominant hand and the direction of the curl.

A gene has different variants called alleles . We all carry two copies of each gene in the genome, one from father and one from mother. In some cases, one of these alleles "dominates".

The combination of genetics, environment and simple random probability is the foundation of human biology.

In Klar's hair and hand model, the gene decides to have two alleles, if you have one or two copies of the dominant allele, you have swirling right-handed and right-handed hair. But when you have two copies of other forms, everything becomes interesting.

Klar explains that these individuals always have a rare twist of the clock and half of them are not right-handed. In other words, in these individuals, the left-handed chance is 50/50.

The combination of genetics, environment and simple random probability is the basis of human biology, from height or weight to resistance to cancer or susceptibility to cancer. Understanding the genetics of handedness can help us understand human genetics in general.

The forehead is very complex biologically and significantly related to the coordination between the brain and hands. The brain itself is asymmetric, with the left hemisphere of the brain and must play a different role in coordinated activities such as pattern recognition or language.

There are subtle differences in the brain structure of right-handed and right-handed people.

Interestingly, there seems to be a subtle difference in the brain structure of right-handed and right-handed people. Does this tendency reflect some kind of nerve in the brain? Some studies have shown that left-handed people have differences in their brain function and behavior.

There are also a number of groups of people whose left-handed people dominate, such as artists and architects. Does this data show that these nerves are beneficial for creativity?

If you want to find someone who can cut in a straight line with a scissors, perhaps any right-handed person can do it. But if you want to find someone who has a mindset beyond the limit, you may want to entice a left-handed person.