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The Difference of Mother and Father In Genetics of Mental Ability


Exegesisme

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The X Factor in IQ

Another important factor in sex chromosome expression is the huge dissimilarity between the information carried on the X and Y chromosomes. The Y has a mere 100 or so genes, and there is no evidence that any of them are linked to cognition. This contrasts sharply with the 1,200-odd genes on the X chromosome. There is mounting evidence that at least 150 of these genes are linked to intelligence, and there is definite evidence that verbal IQ is X-linked. It suggests that a mother's contribution to intelligence may be more significant than a father's—especially if the child is male, because a male's one and only X chromosome always comes from his mother. And in females, the X chromosome derived from the father is in fact bequeathed directly from the father's mother, simply setting the maternal X-effect back one generation, so to speak.

https://www.psychologytoday.com/articles/201109/the-incredible-expanding-adventures-the-x-chromosome

There has, in recent years, been a substantial number of disorders identified which are associated with non-syndromic or ‘pure’ mental retardation, associated with a rapidly increasing collection of cloned ‘X-linked mental retardation’ (XLMR) genes (59). For reasons that are not yet understood, there is an excess proportion of genes on the X-chromosome that are associated with the development of intelligence, with no obvious links to other significant biological functions. Mutations in autosomal genes that are associated with mental retardation often accompany somatic anomalies or overt disruption to structural brain development; they are ‘syndromic’ in character, unlike up to two-thirds of mutations in XLMR genes (60). Recent work has suggested that, in the critical Xp11 region that harbours a large number of such XMLR genes (59), there may be others specialized for abilities such as social intelligence too. Perhaps subtle polymorphic variations in genes that, when non-functional, lead to serious learning difficulties can have relatively specific modulating influences on intellectual or social abilities (35). A key implication of these findings is that male and female brains may differ not only because of their contrasting genetic constitutions, but also because of their sex-steroid environments, and that differences in cognitive and social abilities between the sexes could be directly linked to the influence of X-chromosome genes. Recently, we have learned that there is remarkable traffic, in terms of retrotransposition of genes in both directions, between the X-chromosome and the autosomes; sexual antagonism and sex-biased gene expression may be explicable in terms of this remarkable phenomenon (61). A particularly exciting possibility is that genes which are involved in relatively subtle influences upon behaviour in rodents (54) have evolved to modulate human social responses too or were acquiring new cognition-related functions in primates (62).

http://hmg.oxfordjournals.org/content/14/suppl_1/R27.full#sec-12

I have a hypothesis for a long time about The Difference of Mother and Father In Genetics of Mental Ability. In my hypothesis, the contribution of a father to intelligence is created to his X chromosome. His X chromosome with created intelligence is actually inherited to his daughter, and to his grandson through his daughter.

For improving the genetics of the created intelligence, a well-achieved man should have more children in his later life. However, the practice of human reproduction does really ignored the genetics of the created intelligence. Should human change their behavior of reproduction for improving the genetics of the created intelligence?

Edited by Exegesisme
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I have a hypothesis for a long time about The Difference of Mother and Father In Genetics of Mental Ability. In my hypothesis, the contribution of a father to intelligence is created to his X chromosome. His X chromosome with created intelligence is actually inherited to his daughter, and to his grandson through his daughter.

For improving the genetics of the created intelligence, a well-achieved man should have more children in his later life. However, the practice of human reproduction does really ignored the genetics of the created intelligence. Should human change their behavior of reproduction for improving the genetics of the created intelligence?

My mom taught me how to drive. Does that count?

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