Maternal genes are responsible for our intelligence, a new study has revealed. According to the latest genetic study, the genetic shapers of human intelligence are carried in the female X chromosome. This means that our mothers’ genetics are the main determiners of how clever we eventually end up to be, with the two X and Y chromosomes derived from our fathers making no difference.
Mothers have a higher probability of passing on intelligence genes to their offspring because these strands of genetic material are contained in the X chromosome rather than the Y chromosome from the father. The fact that females have two Xs means that they are more likely to transmit their intelligence to the next generation than males. Before this study, doctors have always believed that both parents are more or less equally responsible for their offspring’s intelligence.
But now, new evidence seems to suggest that the female X chromosome — which carries more than a thousand genes — contributes the most when it comes to intelligence. Medical researchers now believe that any genes inherited from the father that may be responsible for a child’s advanced cognitive functions are probably automatically de-activated such that they end up playing little or no role at all in genetic development.
In case of any single intelligence characteristic that is effected by the mother’s genetics, the corresponding genes from the father will be automatically de-activated. Conversely, for those other offspring features that are effected via the father, their corresponding maternal genes will be later de-activated.
The human genetic system has a category of genes referred to as conditioned genes. These are thought to function only if they are passed on from one parent in some cases and the other parent in other cases. Intelligence shapers are believed to be carried in the genes that are inherited from the mother.
According to a University of Cambridge research study on brain development and genomic conditioning conducted in 1984, maternal genetics are responsible for more material to a child’s brain centers than paternal genetics. Lab studies carried out on genetically-modified rats have demonstrated that those infused with an additional dose of maternal genes develop larger brains and heads alongside smaller bodies. On the contrary, rats infused with an additional dose of paternal genes end up with bigger bodies but smaller heads and brains.
Scientists involved in this research also deduced that there were brain cells that contained only one of either paternal or maternal genes in six different sections of the rat brains that were responsible for controlling varying cognitive functions in the body. Brain cells derived from paternal genes and mostly located in the limbic system were associated with functions like food, sex and aggression.
However, the researchers weren’t able to find any cells linked to paternal genes in the cerebral cortex where the vast majority of advanced cognitive functions like thinking, reasoning, speech and planning are controlled from. Given that rats are quite different from humans, Scottish scientists decided to take a more human approach to investigating the source of human intelligence by interviewing more than 12,686 young people between 14 and 22 years of age every year since 1994. They thus concluded that theories derived from the experiment on rats actually apply in reality.