Lecture: Race, Ethnicity, and Human Variation
Lecture script · about 15–20 minutes spoken · Week 12
Opening
Picture a sunscreen bottle in a drugstore aisle. The label tells everyone to guard their skin against ultraviolet light, the invisible part of sunlight that burns. It doesn't offer one bottle for each skin color. It gives one warning, because the sun reaches every body.
Now picture a form you've filled in. Maybe it was a job application, a clinic intake sheet, or a school form. Near the end it asked about race and ethnicity, with a row of boxes and the words "check all that apply". You may have paused. Which box fits? What if two fit? And who decided what the boxes are?
You'll meet those boxes in many places. A nursing student fills in clinic intake forms. A business student may design a job application. A social-work student reads a city's census tables. In each case it helps to know what the boxes describe, and who made them.
Here's where we are. In Week 1 you met biological anthropology, the subfield that studies human evolution and human variation. Week 2 taught that culture is learned, not inherited. Week 7 gave you power and authority, Service's state, and Fried's stratified society. And Week 11 taught a category that a culture organizes around the body: gender. This week teaches a second one.
Here's the plan. I'll start with how people vary, and why that variation is a gradient. Then we'll ask where most variation lies, with two figures and their sources. We'll weigh one classic study by Boas. We'll define race as a social classification with real effects. We'll set ethnicity apart from race, and name nationalism. And we'll finish by reading the census boxes as the categories of the office that wrote them.
1. Variation is a gradient
Imagine walking slowly across a continent, meeting people in each town along the way. You'd see skin color change. But you wouldn't find a line where one color stops and another starts. You'd see a slow shift, town by town, like the colors in a sunset that blend without any edge.
Anthropologists name that pattern. Human variation is the biological differences among people, such as skin color and body form. It's continuous, and it lies mostly within groups rather than between them. Continuous variation is variation in which a trait such as skin color changes gradually across geography rather than falling into separate boxes.
So why does skin color vary at all? Skin color varies mainly with ancestral exposure to ultraviolet light, and it does not predict other traits. In plain words, skin color is an adaptation. It tracks how much ultraviolet light a person's ancestors met where they lived. It doesn't carry information about intelligence, character, or any other trait.
That's why the sunscreen label gives one warning. Ultraviolet light acts on every body. Skin color is one body's long-term response to it, and nothing more is packed inside it.
Pause and try this. Someone says, "You can tell a person's other traits from their skin color." Does that fit what you've learned?
Think about what skin color actually tracks.
Here's the answer. No. Skin color varies mainly with ancestral exposure to ultraviolet light, and it does not predict other traits.
That's the first wrong turn to avoid: reading skin color as a sign of traits you can't see. When someone links skin color to another trait, ask what evidence links them. Then remember the sunscreen label.
2. Most variation lies within groups
Think about one family at a reunion. Cousins differ in height, eye color, and build, sometimes a lot. Now picture two families from two different towns. The differences inside each family can be as large as the differences between the families. Scale that up, and you've got this week's second idea.
The idea is called within-group variation: the finding that most human variation lies within groups rather than between them. The figures for it come from different analyses, so you state each one with its source, never as one settled number.
A classic study made the idea a number. Lewontin, in 1972, wrote "The Apportionment of Human Diversity", in Evolutionary Biology. He found that most human genetic variation lies within populations, with a figure of about 85 percent. So about 15 percent lies outside them.
A professional body stated the idea too. The American Anthropological Association's Statement on Race, from 1998, says there is greater variation within so-called racial groups than between them. Its figure is about 94 percent of physical variation within those groups. That leaves about 6 percent outside them.
Now set the two side by side. They're 9 percentage points apart. I say percentage points, not percent, because I'm giving the difference between two percentages. Why do they differ? Because they come from different analyses, measured in different ways. So the course states each figure with its source and keys neither one.
Pause and try this. The two figures are about 85 percent and about 94 percent. What do they agree on, even though they differ?
Look at which side of 50 percent each one sits on.
Here's the answer. Both are above 50 percent, so both say most variation lies within groups. The idea is settled, even though the number isn't one number.
Here's the wrong turn. Students often memorize "85" or "94" as if it were a law of nature. Learn the idea as the fact, and learn each figure with its source.
3. Boas and the children of immigrants
Think about a family whose children grew up somewhere new, with a different diet, climate, or kind of work. The children may end up taller or shorter than their parents. Nobody would say the children belong to a different group because of it. Yet for a long time, some body measurements were treated as fixed markers of race.
Boas tested that idea. In 1912 he published "Changes in the Bodily Form of Descendants of Immigrants", in American Anthropologist. He found that children born in the United States to immigrant parents differed in head form from their parents.
Let me walk through the shape of his argument. The assumption he tested was that head form was a fixed racial marker, passed down unchanged. His comparison was immigrant parents and their children born in the new country. His finding was that the children's head form differed from their parents'. So a trait that was supposed to be fixed changed between two generations. That was evidence that traits once treated as fixed racial markers respond to environment.
Later researchers reanalyzed his data. The course mentions those reanalyses in words and keys no figure from them. Here's each side's strongest case, with no verdict. Boas's strongest case is that a trait called fixed changed within one generation, in a new environment, and that's enough to show it isn't a fixed racial marker. The cautious case is that one measure in one study can't settle how much every trait responds to environment. A careful reader keeps that question open.
Pause and try this. What did Boas's 1912 study compare, and what did it find?
Name the two groups first, then the trait.
Here's the answer. It compared immigrant parents with their children born in the United States, and it found the children differed in head form from their parents. That's evidence the trait responds to environment.
Before you call a trait fixed, ask whether anyone ever measured it in a new setting.
4. Race is made, and race is real in its effects
Go back to the boxes on the form. A different country's form, or the same country's form from another decade, would show different boxes. Some boxes get added, some dropped, some renamed. If the boxes were natural groups, they wouldn't keep changing. They change because people make them.
Here's the course's definition. Race is a social classification of people into groups that a society makes. The categories differ across places and times, and the inequality built around them has real effects. So race is not a set of natural biological groups.
That definition has two halves, and you need both. The first half says societies make the categories. The second half says the categories have real effects. A category a society made can still shape where people may live, what work they can get, and how others treat them.
Week 7 gives you the tools for the second half. In Fried's scheme, a stratified society is one in which people have unequal access to basic resources. When a society ties access to land, jobs, or schooling to a category, the category becomes part of how that society is stratified. And Week 7's power and authority ask who made the rule, and whether people accepted it as rightful.
Here's a made-up case. Picture a town whose housing records, long ago, kept some families out of one neighborhood by category. The town made that category, and nothing in biology drew the line. But the rule still decided who could buy a home there. So a category people made had a real effect on a basic resource.
Pause and try this. A classmate says, "Race is a social construct, so it doesn't affect anyone's life." What's wrong with that?
Think about the town's housing records.
Here's the answer. It keeps the first half of the definition and drops the second. Race is made by societies, and the inequality built around it has real effects.
There's an opposite wrong turn too: reading race as a set of natural biological groups. The cure for both is to say the two halves together, every time. Made by a society. Real in its effects.
5. Ethnicity, and the idea of a nation
Picture a neighborhood festival celebrating an ethnic heritage. Stalls sell the heritage's foods. A stage hosts its music and dance. Signs are written in two languages, and some families wear clothing that marks the day. What's on show isn't skin color. It's ancestry, language, food, music, and custom.
The term for that is ethnicity: a shared identity based on ancestry, language, religion, or customs. It's not the same as race. And ethnic identity is how people claim and display their ethnicity, through food, music, language, dress, or a festival like this one.
So race and ethnicity are both social categories, and both have real effects. But they rest on different things. Race sorts people by a society's reading of bodies. Ethnicity gathers people around a shared heritage that they learn and display. Like all of culture, an ethnic identity is learned, and it's shared but never uniform. Two people at the same festival may claim the heritage in different ways.
Now a larger frame. Think of a crowd standing for a national anthem before a game. Strangers act as one people for a few minutes. A nation is a people who see themselves as sharing a history and an identity, often tied to a homeland. Nationalism is the idea and feeling that a nation should govern itself, together with loyalty to that nation. And a nation-state is a state whose government claims to stand for one nation.
Remember Week 7's state: a central government with the power to tax, make law, and enforce it. A nation-state adds a claim that the government stands for one people. It's a claim, not a description, because most states hold people of many ethnicities. The course names these ideas in words and argues no current political question about any nation.
Pause and try this. "The family speaks its grandparents' language at home." Is that about race or about ethnicity?
Ask whether it rests on a shared heritage or on how a society sorts bodies.
Here's the answer. Ethnicity. A shared language passed down in a family is part of a shared heritage, not a reading of bodies.
The wrong turn here is reading ethnicity as the same as race, because forms often ask about both together. Keep asking that one question, heritage or bodies, and the two pull apart.
6. Reading the census boxes
Now, back to the form one last time. The boxes on it weren't invented by the clinic or the employer. They follow a standard written by a government office. So you can read them the way an anthropologist reads any category: as the category of the people who made it.
A census category is a category an issuing body uses to count and describe a population. The course teaches each one as that body's own category, not as a natural group. Two issuing bodies tell you what their categories are. The Census Bureau states that its race categories reflect a social definition of race, not a biological, anthropological, or genetic one. It also states that people may report more than one race.
Then, in 2024, the Office of Management and Budget revised its standard. It now uses 1 combined race-and-ethnicity question with 7 minimum categories. They are American Indian or Alaska Native, Asian, Black or African American, Hispanic or Latino, and Middle Eastern or North African. The other two are Native Hawaiian or Pacific Islander, and White. Middle Eastern or North African is the newly added one, so 6 of the 7 weren't newly added in 2024. And the office describes the categories as socio-political constructs.
Here's what the "check all that apply" line does. If you check 2 boxes, you're still 1 person. So a tally of checked boxes can run higher than the count of people. The boxes aren't separate kinds of human. They're slots a form offers.
And notice the Week 7 move. The office has the authority to draw the boxes. People fill them in because they accept the office as rightful. Yet the office itself calls its categories socio-political constructs. Authority decides what the boxes are. It doesn't turn them into biology.
Pause and try this. How many minimum categories does the 2024 standard have, and how does its issuing body describe them?
Think about the word the office chose for its own categories.
Here's the answer. It has 7 minimum categories, and the Office of Management and Budget describes them as socio-political constructs, not as biological groups.
Here's the reading in one plain sentence. The 7 boxes are categories a government office made and can revise, as it did in 2024, while human variation is continuous and lies mostly within groups. So a census category is a social classification with real effects, not a natural biological group.
Closing
Let me pull it together. Human variation is a gradient, and skin color tracks ancestral ultraviolet exposure without predicting other traits. Most variation lies within groups, and you state each figure, about 85 percent from Lewontin and about 94 percent from the Statement on Race, with its source. Boas found in 1912 that immigrants' children differed in head form from their parents, so a supposedly fixed trait responds to environment.
Race is made by societies and real in its effects. Ethnicity is a shared heritage, not the same as race, and a nation-state is a state whose government claims to stand for one nation. And the 7 census boxes belong to the office that drew them.
Next in this module come the slide deck, the Readings and Resources page, the lecture tutorial, the practice set, and the quiz. Then the discussion, the assignment, and the Ethnography Workshop give you room to apply these ideas. Next week, Religion, Ritual, and Worldview turns from social categories to meaning, starting with the three phases of a rite of passage.
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