"Over the last 50,000 years, modern humans have been subjected to enormous evolutionary pressures, in part from the consequences of their own social culture. They explored new ranges and climates and developed new social structures. Fast adaption, particularly to new social structures, was required as each population strove to exploit its own ecological niche and to avoid conquest by its neighbors. The genetic mechanism that made possible this rapid evolutionary change was the soft sweep, the reshaping of existing traits by quick minor adjustments in the sets of alleles that controlled them. But what began as a single experiment with the ancestral human population became a set of parallel experiments once the ancestral population had spread throughout the world. These independent evolutionary paths led inevitably to the different human populations or races that inhabit each continent."

“Each of the major civilizations has developed the institutions appropriate for its circumstances and survival. But these institutions, though heavily imbued with cultural traditions, rest of a bedrock of genetically shaped human behavior.”

“The classification of humans into five continental based races is perfectly reasonable and is supported by genome clustering studies. In addition, classification into the three major races of African, East Asian and European is supported by the physical anthropology of human skull types and dentition.”

“From an evolutionary perspective, the human races are all very similar variations of the same gene pool. The question that looms over all the social sciences, unanswered and largely unaddressed, is how to explain the paradox that people as individuals are so similar yet human societies differ so conspicuously in their cultural and economic attainments.”

“The recent discoveries that human evolution has been recent, copious and regional severely undercut the social scientists' official view of the world because they establish that genetics may have played a possible substantial role alongside culture in shaping the differences between human populations.”

“I think the subject of race has been so difficult and so polluted by malign ideas that most people have just left it alone, including geneticists. … Most genetic variation is neutral – it doesn't do anything for or against the phenotype, and evolution ignores it – so most previous attempts to look at race have concluded that there's little difference between races. I think this position is the one on which the social scientists are basing their position. … If you look at the genes that do make a difference, selected genes, which are a tiny handful of the whole, you do find a number of differences, not very many, but a number of interesting differences between races as to which genes have been selected. This, of course, makes a lot of sense, because once the human family dispersed from its homeland in Africa, people faced different environments on each continent, different climates, different evolutionary challenges, and each group adapted to its environment in its own way.”

“Tribal behavior is more deeply ingrained than are mere cultural prescriptions. Its longevity and stability point strongly to a genetic basis. This is hardly surprising, given that tribes are the default human social institution. The inbuilt nature of tribalism explains why it took so many thousands of years for East Asians and later Europeans to break free of its deadening embrace.”