What is the genetic significance of humans being either left-handed or right-handed?
The handedness of a person, whether left or right, is determined by the dominant hemisphere of their brain. While most individuals are right-handed, about 10% are left-handed. The exact cause of this is still not well understood but research suggests a combination of genetic and environmental factors could be at play.

Some studies have noted that there is a slight excess of certain genes among left-handers. For instance, a 2013 study
As far as I understand, our handedness is determined by a couple genes, but it does not seem to play any significant role in our actual traits or abilities. If we are talking about other species, the handedness may have a more significant role through evolutionary biology. Is this correct?

Yes, you are correct that in humans, handedness, which is usually determined by the preferred use of one hand for most activities, is influenced by genetics. Specifically, there are