It's probably ~70% genetic. It's depressing, but it's the truth. Just remember there are more differences in groups than between them.
Hi,
From my experience in reading various litterature on the subject, I can't say that I have this impression.
You see, very much of our knowledge about the development and genetics about human kind come
directly from studies of other vertebraes (animals with a spine - central nervous system) as there is
extremely many similarities.
For example; when you look at the expansion of a fetus during it's embryonic stage, it's almost like
seeing evolution play out in those first 8 weeks (development of organ systems). In the beginning
we're really not so much different than the simplest species, but our cells keep dividing and
differentieting more, to add other organs and systems in order to make....us.
So, in these studies we have observed some very interesting things, like the fact that the most
deciding factor to an organism' intelligence are the level and suitability of the stimulus at the time of
ones earliest stages. The has been shown to extremely affect the speed, connectivity and placement
of synapses (junction between two nervous cells) that in the end results in transformation from
short term memory to long term memory - ability to learn and process.
There is also much evidence of children growing up in isolation focusing on the simplest of tasks
concerning only biological needs end up with signinficant mental and physical retardation.
I'm not saying that there isn't a genetic component to the complex, but I'm sceptical of you
percetage estimation though, as it's likely to be very much off the mark.
