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http://www.apa.org/pubs/journals/releases/amp-67-2-130.pdf http://www.apa.org/pubs/journals/releases/amp-67-2-130.pdf It seems very thoroughly accepted - among

http://www.apa.org/pubs/journals/releases/amp-67-2-130.pdf http://www.apa.org/pubs/journals/releases/amp-67-2-130.pdf It seems very thoroughly accepted - among researchers who have studied the subject. The popular press produces a lot of articles downplaying the subject. For example, if a study shows that IQ is likely the result of thousands of genes combined rather than just one or two, there will be ten articles the next day saying "scientists unable to find genetic basis for IQ" and "IQ not genetic."

varjag 11y ago
No, what I mean is that there are genetic factors that aren't necessarily hereditary, or even hereditary but not within the immediate offspring. E.g. my son has the same birthmark as my mother but I don't. Same for a number of Mendelian trait diseases. I am not questioning that IQ might well be a genetic factor, just wondering if there are any conclusive studies that it's directly inherited. Because the study you linked is very open-ended on this, and this has been core premise for the article discussed.
- dragonwriter 11y ago
  > No, what I mean is that there are genetic factors that aren't necessarily hereditary, or even hereditary but not within the immediate offspring. E.g. my son has the same birthmark as my mother but I don't. Same for a number of Mendelian trait diseases. This is not genetic but not "necessarily hereditary", this is hereditary, but requiring a combination of inherited "things" to manifest. (The typical simple case of "Mendelian trait diseases" to which this applies are recessive traits, which require inheriting a copy of the gene from each parent to manifest.) IQ, not being a binary trait, doesn't work the same way, and probably (even to the extent it is genetic) the product of isn't a single, simple genetic trait of any kind, but influenced by a number of different genes. And, also, influenced by lots of environmental factors (and it may turn out that the way in which some of those environmental factors contribute depends on which combination of genetic factors are present.)
  - varjag 11y ago
    > This is not genetic but not "necessarily hereditary", this is hereditary, but requiring a combination of inherited "things" to manifest. Down syndrome is a result of genetic expression but is not a hereditary trait. General, normal human features (like having 5 fingers on each arm and feet) are also genetic but so universal it makes no point describing them as "hereditary". > IQ, not being a binary trait, doesn't work the same way, and probably (even to the extent it is genetic) the product of isn't a single, simple genetic trait of any kind, but influenced by a number of different genes. If it's a function of thousand features as been suggested, this makes the odds for direct trait inheritance not particularly good, no?

varjag 11y ago

No, what I mean is that there are genetic factors that aren't necessarily hereditary, or even hereditary but not within the immediate offspring. E.g. my son has the same birthmark as my mother but I don't. Same for a number of Mendelian trait diseases. I am not questioning that IQ might well be a genetic factor, just wondering if there are any conclusive studies that it's directly inherited. Because the study you linked is very open-ended on this, and this has been core premise for the article discussed.

dragonwriter 11y ago
> No, what I mean is that there are genetic factors that aren't necessarily hereditary, or even hereditary but not within the immediate offspring. E.g. my son has the same birthmark as my mother but I don't. Same for a number of Mendelian trait diseases. This is not genetic but not "necessarily hereditary", this is hereditary, but requiring a combination of inherited "things" to manifest. (The typical simple case of "Mendelian trait diseases" to which this applies are recessive traits, which require inheriting a copy of the gene from each parent to manifest.) IQ, not being a binary trait, doesn't work the same way, and probably (even to the extent it is genetic) the product of isn't a single, simple genetic trait of any kind, but influenced by a number of different genes. And, also, influenced by lots of environmental factors (and it may turn out that the way in which some of those environmental factors contribute depends on which combination of genetic factors are present.)
- varjag 11y ago
  > This is not genetic but not "necessarily hereditary", this is hereditary, but requiring a combination of inherited "things" to manifest. Down syndrome is a result of genetic expression but is not a hereditary trait. General, normal human features (like having 5 fingers on each arm and feet) are also genetic but so universal it makes no point describing them as "hereditary". > IQ, not being a binary trait, doesn't work the same way, and probably (even to the extent it is genetic) the product of isn't a single, simple genetic trait of any kind, but influenced by a number of different genes. If it's a function of thousand features as been suggested, this makes the odds for direct trait inheritance not particularly good, no?