Children's intelligence is inherited from their parents, but is it true that this is mainly derived from the mother? How about father? In China, many pondered the answers to these questions after the appearance of an article on Sina Weibo. The article states that the genetic makeup of a mother has as much as three times the influence in determining a child's intelligence compared to a father.
The article says, "To find out whether a child will be smart or not, what is needed is just to look at his mother. For men who consider themselves not intelligent, it is important for them to find a smart wife. "But is that true? Let's look at the following answer!
The link between the X chromosome and intelligence
The explanation given in the article above is that the genes that determine intelligence are located on the X chromosome (the female chromosome of the female carrier). However, he does not cite any scientific studies to provide any source for each statement.
According to Satoshi Kanazawa in his article, general intelligence is known to be very inherited, and genes that affect general intelligence are thought to be on the X chromosome. That means that boys inherit their general intelligence from the mother alone, while girls inherit their general intelligence from their mother and father. So, women should be able to influence the general intelligence of future generations higher than men.
According to the 1991 article in PubMed Central (PMC), if there are genes that directly determine the intelligence of children, one of them will expect that these gene mutations can produce phenotypes that show effects only on intelligence, and perhaps also with effects secondary to behavior and personality. If so, there should be no somatic changes, no metabolic abnormalities that can be identified, no other neurological signs, and no development of intelligence through age.
Si Dayong, an evolution lecturer at Jilin University, rejected the direct statement made in the Weibo article. "The offspring of certain types of sex have nothing to do with the X and Y chromosomes, but a kind of epigenetic lineage (traits not caused by changes in the DNA sequence, but caused by changes in gene expression)," he said. "I have not found a certain trait that can be lowered more than a mother or father."
Research on inherited intelligence
A study in the 1982 academic journal Behavior Science looked at correlations between parents and children, to pay attention to IQ that the correlation between maternal and child intelligence was slightly higher at 0.464 compared to a father and child at 0.423."I don't think that this slight difference can be considered statistically significant," Si said. "In addition, genetic inheritance is random and complex, beyond human imagination."
Although it has long been believed that heredity plays a role in children's intelligence, new studies show that it has less role than previously thought.
A 2013 study by University of Queensland researchers analyzed the DNA and IQ test results of more than 18,000 children from Australia, the Netherlands, England and America. The result was that they found that hereditary factors accounted for 20-40 percent of children's IQ variation, which was lower than previously estimated.
The researchers further concluded that no single gene variant can strongly predict children's intelligence, and that intelligence inherited genetically is the cumulative effect of many different genes.
Zhao Bowen, a researcher at Shenzhen Huada Gene Research Institute, outlines findings in an article on knowgene.com in 2014.
"At present, there is no DNA site that immediately decides that human intelligence has been found," he said. "The genetic influence of parents on children's intelligence can be more and even less. And children's intelligence tends to have a normal distribution curve, with the average intelligence of both parents as a median. "
Xu Gelin, a neurologist at Nanjing General Hospital of Nanjing Military Command, stressed in a Jinling Evening News report published in November 2014, that genetic heredity is very complicated and random, and that both mothers and fathers have varying degrees of influence genetic in their children.
"For example, if mothers have high IQs, and fathers have low IQs, their children will most likely be in the middle of it," Xu said. It is a statement of contradiction from what is said in Weibo, that to find out the intelligence of a child one of the things needed is to look at the mother. "Of course, it is also well recognized that a child whose parents have a high IQ will generally be quite smart."
Other factors that affect children's intelligence
Dr. Rachel Brouwer, from the Department of Psychiatry at Utrecht University Medical Center in the Netherlands, said that it is true that you can predict children's IQ, based more on parental IQ than on their brain changes, at the group level.
"So, in general, very smart parents will produce very smart children. However, this is not absolute, and it is possible for both parents who have low intelligence to produce children who have a high IQ, and vice versa. "Dr. Brouwer also stressed that the environment has an influence on intelligence, although this influence will be smaller if children are more mature.
Catherine Scott's senior lecturer at Melbourne University's Graduate School of Education places a stronger emphasis on the role of environment and history. "Children don't just share genes," he said. "They also share family, and environment. It also has a lot to do with what they eat, and what their mothers eat. "
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