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Home/Anthropology/Mains PYQ/2016/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2016 15 Marks Model Answer Available

Heredity and Environment in the Formation of Races — 2016 Paper I

Question · 2016 · Paper I · 15 Marks

Explain the role of heredity and environment in the formation of races.

Model Answer

VAID ICS

Approach

  • Demand of Question: Answer the historical wording on 'race formation' but explicitly correct it using contemporary biological anthropology: explain heredity/environment in human variation without endorsing discrete races.
  • Structuring the Response: Classical frame -> evolutionary forces -> environmental selection and plasticity -> genotype x environment/culture -> clines and gene flow -> AABA contemporary position.
  • Key Dimensions to Cover: Mutation/drift/founder effect/gene flow/selection; UV-skin pigmentation; Bergmann/Allen; high altitude; plasticity; clinal variation; AABA 2019; population genetics vs typological race.

Model Answer

Introduction

Classical physical anthropology explained “race formation” through heredity and environment, but contemporary biological anthropology rejects the idea that humanity is divided into discrete natural races. The scientifically defensible question is how hereditary and environmental processes generate geographic population variation.

Body

Heredity transmits genetic variants between generations. Mutation creates new alleles; genetic drift changes frequencies, especially in small or isolated populations; founder effects can amplify rare variants; gene flow reduces differentiation; and natural selection increases variants associated with reproductive advantage in particular environments. Historical isolation and migration therefore produce population structure without creating sharply bounded races.

Environment acts both through selection and phenotypic plasticity. Ultraviolet radiation helped shape clinal variation in skin pigmentation: darker pigmentation protects folate in high-UV environments, while lighter pigmentation can facilitate vitamin-D synthesis under lower UV. Temperature is associated statistically with body proportions described by Bergmann’s and Allen’s ecological rules, although nutrition and history also matter. High altitude has produced population-specific physiological and genetic responses. Diet, disease load, childhood nutrition and socioeconomic conditions can also alter stature, body composition and other phenotypes within a lifetime.

The crucial point is interaction. Phenotypes result from genotype × environment effects, while cultural practices modify both exposure and selection. Similar environments can produce convergent traits in genetically different populations, and neighbouring populations often grade into one another through clines.

The American Association of Biological Anthropologists states that socially recognised races do not accurately represent human biological variation. Most variation is continuous, populations have always exchanged genes, and no “pure” races exist.

Conclusion

Thus, heredity and environment explain human variation, not typological race. Modern anthropology replaces fixed racial classification with population genetics, adaptation, plasticity, ancestry and gene-environment interaction.

2026 In what manner is our understanding of serogenetics and cytogenetics useful in reproductive biology? What are the major ethical issues involved in reproductive technology? 2026 Why the classifications of Indian populations, based on somatometric and somatoscopic characteristics failed to develop a common understanding of the population diversity? 2026 Canalization and catch-up growth. 2026 Genetic polymorphism and natural selection.

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UPSC Anthropology Optional 2016 — Paper I

28 questions

1(b) Cultural Relativism

10 Marks150 words
Syllabus: Paper I > 2.1 The Nature of Culture > Ethnocentrism vis-a-vis Cultural Relativism
2016Paper ICulture & SocietyModel answer available

5(d) Fertility and Fecundity

10 Marks150 words
Syllabus: Paper I > 11.3 Biological and socio-ecological factors influencing fecundity, fertility, natality and mortality
2016Paper IHuman Genetics & Human BiologyModel answer available

5(e) Forensic Anthropology

10 Marks150 words
Syllabus: Paper I > 12. Applications of Anthropology > Forensic Anthropology
2016Paper IApplied & Forensic AnthropologyModel answer available

1(e) Functionalism

10 Marks150 words
Syllabus: Paper I > 6. Anthropological Theories > Functionalism
2016Paper IAnthropological TheoriesModel answer available

1(c) Lineage and Clan

10 Marks150 words
Syllabus: Paper I > 2.5 Kinship > Descent groups > Lineage and clan
2016Paper IKinshipModel answer available

5(c) Neolithic Cultures of India

10 Marks150 words
Syllabus: Paper I > 1.8(b) Cultural Evolution: broad outlines of prehistoric cultures > Neolithic
2016Paper IPrehistoric ArchaeologyModel answer available

5(a) Rh-Blood Group

10 Marks150 words
Syllabus: Paper I > 9.6 Population variation as genetic marker > ABO and Rh blood groups
2016Paper IHuman Genetics & Human BiologyModel answer available

5(b) Rhodesian Man

10 Marks150 words
Syllabus: Paper I > 1.6 Phylogenetic status, characteristics and distribution > Rhodesian Man
2016Paper IHuman Evolution & PrimatologyModel answer available

1(d) Totemism

10 Marks150 words
Syllabus: Paper I > 5. Religion > Forms of religion > Totemism
2016Paper IAnthropology of ReligionModel answer available