Study Notes on Race and Human Variation

CHAPTER 13: Race and Human Variation

Author Information

  • Author: Michael B. C. Rivera, Ph.D., University of Cambridge

  • Source: Revision of "Chapter 13: Race and Human Variation" in Explorations: An Open Invitation to Biological Anthropology (2nd edition)

  • License: CC BY-NC 4.0

Learning Objectives

  • Illustrate the troubling history of "race" concepts.

  • Explain human variation and evolution as the roots of biological anthropology.

  • Critique earlier race concepts based on contemporary understanding of genetic variation.

  • Explain the distribution of biological variation in humans.

  • Identify phenotypic traits reflecting selective and neutral evolution.

  • Discuss implications of human variation for biomedical studies, forensic anthropology, and social issues.

Introduction to Human Variation

  • Biological Differences: Humans exhibit biological variation.

  • Cognitive Drive: There is a universal human desire to categorize other humans.

  • Discipline’s Focus: Biological anthropology studies human biological variation and its sources.

  • Inquiry Importance:
      - Understanding human evolution is academically interesting.
      - Insights into evolutionary processes enhance understanding of our species.
      - Biological variation has medical, forensic, and socio-political implications.

The Significance of Studying Variation

  • Studying human variation informs on biological traits and their evolution over time.

  • Understanding variation can enhance knowledge of our hominin ancestors based on fossil and archaeological evidence.

  • Biomedical implications relate to variations affecting health, disease susceptibility, and social dynamics.

Human Variation Labels

  • Usage of Terms: Terms such as race and ethnicity feature prominently in society and academia.

  • Constructs of Race: Race can be viewed as biologically based or as an ideological construct.

  • Social Implications: Often intersected with ethnicity, socioeconomic status, and cultural context, this influences public perceptions and behaviors, fostering discrimination.

Racism and Prejudice

  • Racism is a prevalent issue, manifesting from bullying to systemic discrimination in society.

  • Prejudice is defined as negative attributes assigned to individuals based on perceived characteristics, which can extend beyond race to abilities, gender, and socioeconomic status.

  • Historical perspectives reveal that racism varies globally and is influenced by cultural contexts.

Scientific Misconceptions and Historical Context

  • Early anthropological studies of race lacked scientific validity and were influenced by socio-historical contexts.

  • Molecular Anthropology: Recent genetics research shows humans share significant similarities genetically, contributing to understanding race as a social construct.

  • Biological anthropologists work toward educating and debunking myths surrounding human variations and diversity.

My Personal Journey in Biological Anthropology

  • Background: The author's mixed Filipino-Chinese heritage informs his views on diversity in academia.

  • Academic Context: Experienced biases in a predominantly white academic landscape, underscoring the need for community among minority scholars.

  • Advocacy for Diversity: Emphasizes the necessity of inclusivity and representation in anthropology.

Historical Race Concepts
Historical Classifications

  • Ancient Egypt: Classification of humans as a function of geography (e.g., Aamu, Nehesu, Reth, Themehu based on skin color and behavior).

  • The Bible: Historic lineage connecting human groups to Noah's sons, reflecting early racial categorizations.

  • Great Chain of Being: Ancient Greek philosophy introduced a hierarchical perspective of living organisms, categorizing humans based on perceived abilities.

Race Classification and the Scientific Revolution

  • Scientific Revolution (~1400-1600): Shift toward empirical observation and experimentation; initiated by scholars like Copernicus and Galileo.

  • Carl Linnaeus: Developed binomial nomenclature, classified humans with nonhuman primates, and created racially charged groups based on physical traits that lacked scientific grounding.

  • Blumenbach's Five Races: Proposed that cranial variations represented standalone human "subspecies," introducing ideas of degeneration and superiority that favored Caucasians.

The Rise of Scientific Racism

  • Between the 1800s and mid-1900s, scientific methods were misused to justify racial hierarchies.

  • Cranial Measurements: Samuel Morton’s studies misattributed cranial size differences as indicators of intelligence, perpetuating racial stereotypes.

  • Biological Determinism: Theory linking physical attributes to behavior and morality, redundant in modern discourse, but historically significant in justifying colonialism and racial exploitation.

Modern Physical Anthropology

  • Early 20th-century figures like Aleš Hrdlička and Franz Boas advocated for a scientifically rigorous approach to human variation.

  • Boas's Findings: Demonstrated that skull dimensions were influenced by cultural factors rather than race, opposing previous essentialist views.

Continuity of Eugenics Ideas

  • Early 1900s continued eugenics practices under the guise of “scientific” classification, leading to human rights violations.

  • Nazi Germany: Utilized eugenics to justify horrific actions against perceived inferior populations.

Shifting Perspectives Post-1950

  • Post-1950 anthropology moved away from rigid race concepts towards recognizing human variation through evolutionary lenses.

  • Emphasis on isolating genetic distance based on geographic proximities, leading to more complex understandings of human populations as continuous rather than discrete groups.

Human Variation Today

  • Nonconcordance of Traits: Most human traits vary independently, contradicting earlier essentialist views.

  • Clines of Variation: Frank B. Livingstone emphasized that human traits display clinality, demonstrated with height and skin color as examples.

  • Clinical Relevance: Variations in skin color correlate with UV radiation exposure; lactase persistence varies based on dairy consumption histories.

Genetic Studies and Findings

  • Data from recent genetic studies reveal that human genetic variation is greater within groups than between groups, challenging traditional conceptions of races.

  • Landmarks studies (e.g., Rosenberg et al., 2002) found that 85% of genetic variation occurs within local populations, undermining race as a biological category.

Out-of-Africa Model and Genetic Isolation

  • Genetic studies illustrate an out-of-Africa model of human migration, with population genetic diversity decreasing with distance from sub-Saharan Africa.

  • Isolation-by-Distance Model: Predicts that genetic similarity decreases with increased geographical distance, emphasizing human connection over disconnection based on race.

Homogeneity Across Species

  • Humans share 99.9% of their DNA, revealing a significant genetic homogeneity compared to other species, notably primates.

  • Molecular Studies: Studies on primates show they display greater genetic variation across groups, contrary to the misconception of higher human diversity.

Selected and Neutral Evolution

  • Different phenotypic traits reflect patterns of evolution, with some traits elucidating complex interactions with environments leading to skin color variations.

  • Recent scientific advancements shine light on neutral evolutionary processes, linking them with notions of adaptability under environmental pressures.

Social Contexts of Race and Health

  • Current dialogues, such as those sparked by the Black Lives Matter movement, reflect upon the intersections of race, systemic racism, and societal health disparities.

  • Racial Disparities in Health: Increased incidents of medical neglect or misdiagnosis among marginalized populations due to lingering misconceptions about race.

Forensic Anthropology Evolutions

  • Forensic anthropologists should redefine approaches to ancestry estimation based on the understanding that race categories do not hold scientific validity.

  • The challenges in assigning ancestry due to variability across individuals highlight the inadequacy of race as a definitional tool.

Key Concepts and Terminology

  • Cline: A gradient of change in traits or allele frequencies among populations.

  • Genetic Drift: Random changes in allele frequencies in a population due to chance events.

  • Biological Determinism: The assumption that biology limits behavior.

  • Eugenics: Movement advocating for selective breeding and sterilization to enhance human populations.

  • Nonconcordance: Situations where genetic traits do not correlate with one another.

  • Racism: Systematic discrimination based on perceived racial distinctions.

  • Biological Anthropology: Study of human evolution, adaptation, and variation.

Conclusion

  • Continuing disparity in how race constructs influence societal dynamics underlines the importance of anthropological insights and accurate scientific provisions to address real-world implications efficiently.

Review Questions

  1. How is genetic variation of the human species distributed worldwide?

  2. What evolutionary processes produce genetic/phenotypic variation within and between populations?

  3. Should we continue to attribute any value to race concepts based on current understanding of human biological variation?

  4. How to communicate scientific findings on human biological variation accurately to the public?

References and Further Readings
Key Texts:

  • Roberts, Dorothy E. (2013). Fatal Invention: How Science, Politics, and Big Business Re-create Race in the Twenty-First Century.

  • Livingtone, Frank B. (1962). "On the Nonexistence of Human Races." Current Anthropology.

  • Rosenberg, Noah A. et al. (2002). "Genetic Structure of Human Populations." Science.

  • Jablonski, Nina G. (2004). "The Evolution of Human Skin and Skin Color." Annual Review of Anthropology.

Online Resources:

  • TEDx Talks featuring founders of Black Lives Matter.

  • YouTube channels discussing race and genetics in relation to anthropology and health.