Clearly, there's some diversity of opinion floating around out there...
http://en.wikipedia.org/wiki/Bruce_Lahn
Bruce Lahn is a geneticist at the University of Chicago. He is also the founder of the Center for Stem Cell Biology and Tissue Engineering at Sun Yat-sen University, Guangzhou, China. His previous research specialized in human genetics and evolutionary genetics, especially human sex chromosome evolution and the genetic basis that underlies the evolutionary expansion of the human brain. Lahn's current research interests include stem cell biology and epigenetics.[1] His research on the brain size gene, MCPH1, led to the hypothesis that an archaic homo sapiens lineage such as the Neanderthals might have contributed to the recent development of the human brain.[2] His research also suggested that newly arisen variants of two brain size genes, ASPM and MCPH1, might have been favored by positive natural selection in the recent human history.[3] This research provoked controversy due to the finding that the positively selected variants of these genes had spread to higher frequencies in some parts of the world than in others (for ASPM, it is higher in Europe and surrounding regions than other parts of the world; for MCPH1, it is higher outside sub-Saharan Africa than inside).[4] He has advocated the moral position that human genetic diversity should be embraced and celebrated as among humanity's great assets.[5]
Lahn came to the U.S. from China to continue his education in the late 1980s.[6]
Lahn's honors include the Merrill Lynch Forum Global Innovation Award, the TR100 Award from Technology Review, the Burroughs Wellcome Career Award, and a Searle scholarship. He was also named to the 40-Under-40 list by Crains Chicago Business. Lahn received his B.A. in biology from Harvard University and his Ph. D. from the Massachusetts Institute of Technology.
"The 37-year-old Dr. Lahn says his research papers, published in Science last September, offered no view on race and intelligence. He personally believes it is possible that some populations will have more advantageous intelligence genes than others. And he thinks that "society will have to grapple with some very difficult facts" as scientific data accumulate. Yet Dr. Lahn, who left China after participating in prodemocracy protests, says intellectual "police" in the U.S. make such questions difficult to pursue.
Scientists believe that a small group of anatomically modern humans struck out from Africa probably less than 100,000 years ago. After arriving on the Eurasian land mass, they continued to split up and eventually humans populated nearly every corner of the globe. One use of genetic research is to probe how each group evolved differently after becoming isolated from the others. Recently created genetic maps of people of African, Asian and European ancestry make that research easier.
For instance, researchers have found that most Europeans have a genetic variant that lets them fully digest milk as adults. The variant is much less common in Africa and Asia, where lactose
intolerance is widespread. Scientists theorize that it spread quickly among Europeans because drinking milk from domesticated dairy animals conferred a nutritional advantage. Similar evolutionary reasoning may explain why many people in malaria-prone parts of Africa carry gene variants linked to malaria resistance."
Quote from OPTIONAL777:
Races are not breeds. I see black and white cats, black and white horses, black and white dogs. They are just cats, dogs, and horses.
"A race is a variety of a species, consisting of a more or less distinct population with anatomical traits that distinguish it clearly from other races. This biologist's definition does not fit the reality of human genetic variation today. We are an extremely homogenous species genetically. As a matter of fact, all humans today are 99.9% genetically identical, and most of the variation that does occur is in the difference between males and females and our unique personal traits. This homogeneity is very unusual in the animal kingdom. Even our closest biological relatives, the chimpanzees have 2-3 times more genetic variation than people. Orangutans have 8-10 times more variation.
It is now clear that our human "races" are primarily cultural creations, not biological realities. The commonly held belief in the existence of human biological races is based on the false assumption that anatomical traits, such as skin color and specific facial characteristics, cluster together in single distinct groups of people. They do not. There are no clearly distinct "black", "white", or other races.
In the final analysis, it is clear that people, not nature, create our identities. Ethnicity and supposed "racial" groups are largely cultural and historical constructs. They are primarily social rather than biological phenomena. This does not mean that they do not exist. To the contrary, "races" are very real in the world today. In order to understand them, however, we must look into culture and social interaction rather than biology.
http://anthro.palomar.edu/ethnicity/ethnic_1.htm#return_from_ethnic_identity_question