As a guest on another education site this week, I ended up in a predictable debate with several readers about whether "the races" are biologically/genetically distinct subgroups to the human race. Here's how I responded. -Mica
***Note: To print out a pithy version of similar ideas, see The American Anthropological Association's Statement on Race, at http://www.aaanet.org/stmts/racepp.htm
Old myths that so-called “races” are biologically/genetically distinct subgroups to the human race die hard. Look up the science. Here are two resources: http://www.understandingrace.org; and How Real is Race? A Sourcebook on Race, Culture, and Biology (2007).
How Real is Race demonstrates that “There are no subspecies of humans” (xv) and that racial categories are a “biological fallacy and cultural reality” (xvi). See particularly the chapter “Why Contemporary Races are Not Scientifically Valid,” which is full of scientific knowledge about the invalidity of racial categories from a biological perspective. See also “Human Biological Variation, What We Don’t See,” which demonstrates that “populations differ genetically but these populations do not correspond to major racial groupings.” (35)
Here are some “gold nugget” points from that book. Even though some populations share some propensities for some diseases, the groups we have come to call “races” just don’t share enough other exclusive genetics to be biologically valid containers for classifying human diversity. The groups we have come to call “races” – “whites,” “blacks,” and “Asians,” for example -- are too genetically diverse internally to be classified scientifically as genetic, biological populations.
How Real is Race shows that Lewontin’s famous 1972 study showed that almost 95% of “total human genetic diversity” occurs WITHIN the geographic-origin populations we’ve often called “races.” (65) Indeed, as How Real is Race reminds us, “Africa also contains more human genetic diversity than any other geographic area in the world” (63). Lewontin concluded that “racial classification is now seen to be of virtually no genetic or taxonomic significance” (66).
Scientists a few centuries ago decided that a handful of “races” could be classified based on a selection of visible traits (skin color, hair texture, nose and eye shape, for example). Those visible traits are genetic, of course, but they are too genetically insignificant to be used for classifying subgroups of the human race. As How Real is Race puts it, “If we wanted to classify people by genetic traits, it would probably make more sense to form races based on ABO blood type or lactose intolerance than to base them on skin color or nose shape.” (35)
Humans originated in Africa, then migrated elsewhere on the globe and developed different appearances, in part due to “adaptations of populations to . . . different microclimates” (44-5). But that doesn’t mean that these groups became so genetically different that we should label them genetic subgroups to the human race. How Real is Race puts it nicely: “Given the 30,000 or so genes in the human genome,” racialized appearance traits “constitute only a small fraction of the total genetic variation within the human species” (62). Most of humans’ genetic variation is invisible. And, “Most human biological variation lies at the individual level.” (61)
Appearance traits don’t even classify humans neatly into “races.” Check out http://www.pbs.org/race/004_HumanDiversity/004_01-explore.htm, which demonstrates visually that populations have “mixed” throughout world history and that various appearance traits are shared round the globe, not easily clumped into “races.” For example, some people who are “Asian” share the same skin color with people who are “white,” and some people in India share the same skin color with people who are “black.” And people across Africa, whom Americans might all call “black,” have infinite shades of skin color! Types of noses and hair are similarly shared worldwide.
Here’s the point: our genetics simply don’t divide us into the “races” we have come to take for granted. The categories just don’t work out, genetically speaking. That’s why I say they are “social realities built on biological fictions.”