Overview
Many people believe that physical characteristics of various Homo sapiens (and, according to some, certain non-physical characteristics such as culture, geography, religion, language and nationality) justify the classification of humanity into various races. This belief emerged during the European Enlightenment and was at that time generally accepted by both the scientific and lay communities.
In the early-to-mid 20th century many biological and social scientists began questioning the accepted causal relationship between biological and cultural attributes, and some began questioning the taxonomic validity of race. In the decades immediately after the Second World War (in which racial theories were used as justification for enormous crimes), and gaining special momentum in the 1960s (in the context of the U.S. civil-rights struggle and global anti-colonial struggle), some came to reject the concept of race as a biological fact altogether, at least as it applies to humans. Nevertheless, the belief that human races exist is unquestionably real and, like any belief held by a large number of people, is significant in itself regardless of its scientific accuracy. Thus, the concept continues to impact people through its effect on social behaviour (see communal reinforcement).
In biology, a race was defined as a recognisable group forming all or part of a monotypic or polytypic species. A monotypic species has no races (this can also be expressed: "a monotypic species has only one race"). Monotypic species can occur in several ways:
- All members of the species are very similar and cannot be sensibly divided into biologically significant subcategories.
- The individuals vary considerably but the variation is essentially random and largely meaningless so far as genetic transmission of these variations is concerned (many plant species fit into this category, which is why horticulturists interested in preserving, say, a particular flower color avoid propagation from seed but instead use vegetative methods like propagation from cuttings).
- The variation between individuals is noticeable and does follow a pattern, but there are no clear dividing lines between separate groups: they fade imperceptibly into one another. This is called clinal variation, and always indicates substantial gene flow between the apparently separate groups that make up the population(s). Populations that have a steady, substantial gene flow between them are likely to comprise a monotypic species even when a fair degree of surface variation is obvious.
A polytypic species, thus, has two or more races (or, in current parlance, two or more "sub-types"). These are separate groups that are clearly distinct from one another and do not generally interbreed (although there may be a relatively narrow hybridization zone), but which would interbreed freely if given the chance to do so. Note that groups which would not interbreed freely, even if brought together such that they had the opportunity to do so, are not races: they are separate species.
Humans clearly vary considerably. By far the greater part of human genetic variation, however, occurs within "racial" groups and the variation between racial groups accounts for less than 10% of the total. Nevertheless, although the difference between "races" is less than 10% of the difference within any particular "race", this does not in itself invalidate the suggestion that there might be different races of Homo sapiens sapiens. The rules of biological classification do not set any 'smallest allowable difference' between taxa: any distinct difference is sufficient.
However, a distinct difference is only one of the two conditions that must be satisfied before a different form can be classified as a race. The other is lack of significant gene flow between the populations. In the case of human "races", interbreeding is not only possible but widespread. Given the way that different human "races" fade gradually from one to another in many parts of the world, the overwhelming majority of the current generation of cultural anthropologists draw the conclusion that human "racial" variation is in fact clinal, and that the human species is monotypic. Of course, the delicacy of this definition has left the issue much in debate, especially among physical anthropologists, for if "clines" lead to large areas of separate near-homogeneity, as they seem to do in places like Kenya, Sweden and China, then the people in these areas seem marked off by delimeters resembling nothing so much as the traditional physiological touchstones of "race".
Historians, anthropologists and social scientists today are apt to describe the notion of race as a "social construct", using instead the concept of "population" to refer to communities distinguished by characteristic distributions of gene variants. The concept of biological race, however, has proved resilient and is still used in day-to-day speech even among those who, when questioned, reject the formal existence of race. This may be a matter of semantics, in that such scientists and laypeople use the word "race" to mean "population", or it may be an effect of the underlying cultural power of the concept of "race" in racist societies. Whether it be "race", "population" or some other appellation, a working concept of sub-specific clustering is crucial because a number of group differences, such as gene mutation profiles strongly linked to certain human subgroups (see Cystic fibrosis, Lactose intolerance, Tay-Sachs Disease and Sickle cell anemia), are difficult to address without recourse to a category higher than "individual" and lower than "species".
History of the term
The historical definition of race, before the development of evolutionary biology, was that of common lineage, a vague concept interchangeable with species, breed, cultural origin, or national character ("The whole race of mankind." --Shakespeare; "Whence the long race of Alban fathers come" --Dryden).
The word race in this general sense of a group of people with common descent was introduced into English in about 1580.
This late origin is consistent with the thesis that the concept of "race" as defining a very small number of groups based on greatly separated lines of descent dates at least in the West from the time of Columbus. Older concepts that were also at least partly based on common descent, such as nation and tribe, entail a much larger number of groupings.
In any case, the first published classification of humans into distinct "races" seems to have been François Bernier's Nouvelle division de la terre par les différents espèces ou races qui l'habitent ("New division of Earth by the different species or races which inhabit it"), which appeared in a Parisian journal in 1684. Bernier (1625-1688) distinguished four "races":
- Europeans, including South Asians, North Africans and native Americans, but excluding Lapps
- Far Easterners
- Sub-Saharan Africans
- Lapps
The 19th-century concept of race was based primarily on morphological and cosmetic characteristics such as skin color, facial type, cranial profile and amount, texture and color of hair. Though such characteristics have since been declared by many experts to have a minimal relationship with any other heritable characteristics, they retain some persuasive force because it is easy to immediately distinguish people based on physical appearance.
Because people of different races can interbreed, this method of classification is weak (compare with species). In other words, racial purity does not have a clear biological meaning. On the other hand, it is clear that for an extended period of time after Homo sapiens' first migrations from Africa (probably around 80,000 BC) and before the rise of wheeled and seagoing transportation (around 3000 BC), geographically isolated groups of people underwent some degree of divergent evolution. Whether that degree was high enough to merit strict taxa beneath the species level is the primary question that has roiled the generations of human biologists since the 1800s. It is a complicated issue full of semantic and emotional pitfalls, with much at stake on the consensus, for educators, physicians, political officeholders, judges, law enforcement officers and many others look upon scientific findings as the bedrock authority for their curricula, diagnostic methods, budget expenditures, case law and criminal suspect profiling.
Among the 19th-century naturalists who defined the field were Georges Cuvier, James Cowles Pritchard, Louis Agassiz, Charles Pickering (Races of Man and Their Geographical Distribution, 1848), and Johann Friedrich Blumenbach. Cuvier enumerated three races, Pritchard seven, Agassiz eight, and Pickering eleven. Blumenbach's classification was widely adopted:
- the Caucasian, or white race, to which belong the greater part of the European nations and those of Western Asia
- the Mongolian, or yellow race, occupying Tartary, China, Japan, etc.
- the Ethiopian, or black race, occupying most of Africa (except the north), Australia, New Guinea and other Pacific Islands
- the American, or red race, comprising the Indians of North and South America
- the Malayanan, or brown race, which occupies the islands of the Indian Archipelago
Researchers in the decades following Blumenbach classified the Malay and American races as branches of the Mongolian, leaving only the Caucasian, Mongolian, and Ethiopian races. Further explication in the early and mid twentieth century, notably by American anthropologist