The word gene is often used when gene allele would be more appropriate. A gene is a location on a chromosome which may contain one of several alleles. For example, the gene for eye color may have an allele for light brown, dark brown, blue, green, or grey eyes.
Many different alleles determine intelligence.
Tay-Sachs and Gaucher's are determined by a gene allele that is dominant for higher intelligence and recessive for the diseases. If a person has both genes for one of these, the person has the disease and more intelligence. If the person has one gene for one of these the person does not have the disease, but does have more intelligence.
The superior average intelligence of the Ashkenazim is a comparatively recent development. Ashkenazi Jews had to evolve more intelligence quickly, so they picked up some dangerous intelligence alleles.
The great majority of human evolution took place in Africa. Nevertheless, agriculture, civilization, and cold climates select more vigorously for intelligence than Africa, so races that evolved further outside of Africa have higher IQ averages than Negroes.
Again, you can't eliminate environmental factors nor can you explain civilizations in cold areas that never developed to a high level or civilizations in hot areas that did.
The development of civilization was influenced by multiple factors, and there is no research to indicate whether or to what degree a "genetic intelligence" was a factor. In addition civilizations have risen and fallen ... a sudden lack of intelligence or like the beginning of civilization, a multiplicity of factors?
Agriculture led to settled communities. Settled communitees led to a freeing of time and energy from activities related to survival. Settled communities led to urbanization and the development of specialties. All of this is pollinated by trade, the movement and migrations of peoples bringing new and different ideas with them.
And, there have to be certain factors in place for it to develop in the first place. Often times they begin at rivers, which help agriculture and trade. They need to be in an area where there are plant and animal species ammenable to domestication and MOST are not. Despite that great civilizations arose in Zimbabwe, the American Southwest (Anasazi), as well as the Incas and Mayans.
The northern climates, Scandinavia for example, didn't develope a great civilization on its own and many "great civilizations" grew through the conquest or mingling of others and absorbtion of knowledge and skills from them that changed them from "barbarian" to "civilized".
The problem with your simplistic explanation is omits this larger picture that would mess up the "racial intelligence" theory.
Ancient Egyptians were Caucasians. Their ancestors evolved in Asia and crossed the Sinai Peninsula after they developed agriculture, but before they developed civilization.
Today Egyptians have higher IQ averages than Negroes, but lower averages than Europeans, who developed civilization later, but who evolved in colder climates.
At this point you you are diving deep into the pseudo-science of racism, as defined by the belief that one race is superior/inferior to another. You can only maintain it by discounting or ignoring anything that contradicts it.
Even your choice of words is revealing: Asians, Jews, Caucasions and...The Negro.
You ignore the role environment, education and culture plays, you ignore the pitfalls of "national IQ" ratings, and the fact there are multiple types of intelligence which we are only just beginning to understand.
lisa I notice you agree with SOME of what Hector says, what are your thiughts on the direction this is going and the conclusions he is drawing?
Hector, you have referenced eugenics several times, which is highly disturbing given the history of such a movement and how it culminated in the slaughter of millions of Jews, Slavs, the disabled, gays and more, all based on the fact they considered them genetically and racially inferior supported by the pseudo-science of race and intelligence. This pseudo- science, loosely supported by cherry picked data, has spawned numerous canards against groups such as Jews and Blacks that are both ugly and false. Your "science" sounds convincing until you pick it apart because you have to simplify everything in order for it to hold.
Is there a genetic component to "intelligence"? There quite likely are many, in conjunction with environmental factors that lead to the expression of multiple types of intelligence. That is not so easily broken down into neat racial or ethnic packages.