The considerable part of people is sure that evolution needs thousands or millions of years. Biologists, however, know very well that it happens much faster. So, are humans still evolving? Read the article to get the answer!
Nowadays, owing to the genomic revolution, scientists have a perfect opportunity to follow the population-level genetic changes that actually spot evolution in action. And researches keep on doing this in humans.
When people think of human development, their minds walk back to the thousands of years it took natural mixture to create the modern-day man. But there is quite an interesting question: are humans still evolving?
According to the newest researches, regardless of industrialization and modern technology, humans keep on evolving.
The prominent doctor Virpi Lummaa, who is the Head of the University of Sheffield's Human Life-History Project and the Department of animal sciences, says the following:
“It is a widespread misapprehension that evolution took place a long time ago, and that to understand ourselves we must look back to the hunter-gatherer days of humans. But not only are we still evolving. We are doing so even faster than before. In the last ten thousand years, the pace of our evolution has sped up 100 times, creating more mutations in our genes, and more natural selections from those mutations”.
Therefore, now we are going to show you definite examples that illustrate humans keep on evolving.
Humans have blue eyes
Formerly, all people had brown eyes. About ten thousand years ago, people who lived near the Black Sea made a genetic mutation that turned brown eyes blue. While the reason blue eyes have persisted stays a bit of secrecy, there is a theory that they act as a sort of fatherhood test.
There is sturdy evolutionary force for a man not to put in his fatherly resources in another man’s child. Since it is practically unworkable for two blue-eyed mates to make a brown-eyed infant, our blue-eyed male ancestors could have sought out blue-eyed mates as a way of guaranteeing fidelity.
Humans` brains get smaller
While some people believe that humans large brains make them smarter than the rest of the animal world, in reality people`s brains have been getting smaller over the last thirty thousand years. The standard volume of the human brain has actually diminished from 1.500 to 1.350 cubic centimeters. And it is corresponding to a chunk the mass of a tennis ball.
There are more than a few diverse conclusions as why this has happened. One group of scientists considers that humans shrinking brains indicate that people have been getting stupider. In the past, brain volume diminished as societies became more complex, thus, offering that the security net of contemporary society negated the association between survival and intelligence.
According to another theory, humans’ brains have been getting smaller because lesser brains are more resourceful. Scientists give the simple explanation to it. As the brain gets smaller, it is being rewired to operate much faster but take up less space.
In addition, there is a hypothesis that lesser brains are an evolutionary benefit because they make people less violent, allowing humans working jointly to resolve problems, rather than destroy each.
Humans oppose illnesses
In 2007, a company of scientists was working on finding definite signs of recent evolution. As a result, they uncovered 1.850 genes that have become widespread in humans only in the last thirty-five thousand years. And plenty of them are devoted to combating infectious illnesses like malaria.
Over ten innovative genetic variants for combating malaria have been spreading quickly amongst Africans. According to another research, natural selection has favored city inhabitants. Living in cities has created a genetic variant. It allows being more opposed to such sicknesses like leprosy and tuberculosis.
The respected doctor from the School of Biological Sciences at Royal Holloway, Ian Barnes, gives the following explanation for this theory:
“This seems to be a stylish example of evolution in action. It flags up the significance of a recent aspect of our evolution as a species, the development of cities as a selective force.”
Humans ingest milk
Historically, the gene that regulated a human's capability to absorb lactose shut down as they were weaned off of their mother's breast milk. However, when people started to domesticate sheep, cows, and goats, being able to ingest milk became a nutritionally beneficial quality.
In 2006, another researcher offered a theory that such an acceptance for lactose was still developing in East Africa three thousand years ago. That genetic mutation for absorbing milk is now carried by over 96% of Northern European inheritors.
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