Why Are Left Handers So Rare
Left handed people.
Why are left handers so rare. According to this article in scientific american what causes some people to be left handed and why are fewer people left handed than right handed the issue is solidly the way genetics influence who is right left handed. It comes down to these 2 words. The rate of left handed people has remained steady about 10 of the population for millennia. So the real reason why it is less common is lower survival rates beginning with early fetal practice and breach birth.
Why is left handedness so rare. According to scientists having one hemisphere dominate is much more efficient which is why some left handers are at increased risk for learning impairments and brain disorders. Scientists have been researching this question for a long time. By christopher zara 2 minute read.
Previous research has suggested that left handedness is due to genetic differences in the brain. And so being left handed can have knock on effects on the way the brain is arranged. According to the researchers in addition to the genetic predisposition a social factor may also play a role in explaining why the proportion of right handed people is so large. Left handers do have slightly higher death rates pretty much across the lifespan that is also a force at work here because dead people cannot pass on their genetics.
The right side of the brain controls the left hand and vice versa. Two scientists set out to find a definitive answer for why just 10 of people are left handed and found some evidence that suggests the ratio could be genetically determined. Scientists have long wondered why left handed people are a rarity. According to the article handedness is based on two genes.
Then why are lefties so rare.
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