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Does a child's IQ depend on his father or mother? Does heredity have a great influence on children's

Will the intelligence level of a child be high if he marries a wife with high intelligence? The mother is the first teacher of the child, and the mother with high education level will bring high-quality family education to the child. So for children, whose IQ is decided by parents?

Recently, there is a popular saying on the Internet that "if you marry a smart wife, your child will be very smart." because human intelligence related genes are mainly concentrated on the X chromosome, women have two X chromosomes, and men only have one, so the intelligence of mothers plays a more important role in genetics. For boys, it's totally influenced by their mother's intelligence. Is that true?

According to the article "intelligence influence of X chromosome" published in the 6th issue of nature review genetics in 2005, at least 40% of the nearly 1000 protein coding genes on X chromosome are expressed in the brain, which is higher than that of the autosomal and much higher than that of the Y chromosome. That is to say, X chromosome has a great influence on brain development and intelligence level.

However, the U.S. survey shows that the difference between the correlation between mother's and son's IQ and the influence of father's on son's IQ is less than 10%. Such a small gap is not enough to show that mother's intelligence has an essential impact on children. Wang Li, a researcher at the Institute of psychology of the Chinese Academy of Sciences, said that gene is the main substance of genetic variation, and it is wrong to control brain work by guiding protein synthesis, formation and coding, because growth environment plays a more important role in human intelligence.

At the same time, gene division and inheritance are very complex processes. In the process of generation to generation, how children inherit their parents' genes also has certain randomness, so genius is also a 'probability'.

Tang Yiyuan, director of brain imaging research institute of Texas Institute of technology, said that human genetics is completed under the joint action of many pairs of chromosomes, not just a pair of chromosomes. 'human itself is a perfect system. There are many factors that affect human system. Biological mechanism, that is, gene is only one side, but also influenced by environment and human experience and behavior in the environment. The behavior and self-regulation learned after being influenced by the environment in turn affect and restrict gene expression. Therefore, genes only determine the potential of intelligence from the perspective of pure physiology, and whether they can be developed depends on the excavation and cultivation of the day after tomorrow. '

According to the comprehensive assessment of scientists, heredity has an impact on intelligence of about half, and the rest is determined by the environment of postnatal growth, and the influence of mothers in daily life may be greater. The mother is the first teacher of the child, and the mother with high education level will bring high quality family education to the child. Physiologically speaking, in some remote areas, women's education level is generally not high, and their childbearing age is generally small. Due to early childbearing, their bones and tissues have not yet grown up. If they assume the responsibility of pregnancy, it is easy to cause adverse effects on the growth of the fetus. Compared with ischemia and malnutrition, it also increases the risk of intellectual impairment.

The influencing factors of intelligence are very complex, and from the perspective of genetics, how chromosomes split is also full of 'mystery'. Therefore, there are both innate and postnatal factors that affect intelligence. As for which factor will prevail, the scientific community has not yet made a positive answer.