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Home/Anthropology/Mains PYQ/2015/Paper I/Human Evolution & Primatology
UPSC MainsAnthropology Optional Paper I 2015 15 Marks Model Answer Available

Biological and Cultural Factors in Human Evolution — 2015 Paper I

Question · 2015 · Paper I · 15 Marks

Elucidate the biological and cultural factors in Human Evolution.

Model Answer

VAID ICS

 Approach

  • Demand of Question: Elucidate human evolution as a feedback process between biological evolution and cumulative culture, not as two parallel lists.
  • Structuring the Response: Biological mechanisms/anatomical changes -> cultural innovations -> reciprocal gene-culture effects -> niche construction -> synthesis.
  • Key Dimensions to Cover: Mutation/selection/drift/gene flow; bipedalism; encephalisation; tools/fire/cooking; food sharing/alloparenting/language; Washburn (1951); lactase persistence; malaria/agriculture; niche construction.

Model Answer

Introduction

Human evolution is best understood as a biocultural process in which biological change altered behavioural possibilities, while culture itself became a major selective and ecological force.

Body

Biological factors provided the evolutionary substrate. Mutation and recombination generated variation; natural selection, genetic drift and gene flow altered its frequencies. Bipedalism reorganised the pelvis, lower limb and hand-use system; changes in dentition and gut energetics accompanied dietary shifts; encephalisation increased cognitive flexibility. Climate variability repeatedly changed habitats and resource distributions, favouring behavioural adaptability rather than a single fixed adaptation.

Culture progressively modified these pressures. Tool manufacture expanded access to carcasses, plant foods and new habitats. Control of fire and cooking altered food texture, digestibility and energy return. Cooperative food sharing, prolonged childhood and alloparental care supported learning and large-brained development. Language and symbolic communication accelerated social transmission, allowing useful behaviour to spread faster than genes.

The relationship is reciprocal. Washburn’s “New Physical Anthropology” (1951) helped shift attention from racial typology to evolutionary process and behaviour. Modern gene-culture coevolution provides concrete examples: dairying favoured lactase persistence in some pastoral populations; agriculture changed pathogen exposure and favoured alleles associated with malaria resistance; high-altitude cultural settlement created a context in which hypoxia-related variants were selected.

Niche-construction theory extends this insight: humans do not merely adapt to environments but transform them through fire, settlement, agriculture and technology, thereby creating new selection pressures.

Conclusion

Hence, biology made culture possible, but culture increasingly redirected biological evolution. Human evolution is therefore neither purely anatomical nor purely cultural; it is the cumulative outcome of feedback between genes, bodies, behaviour, technology and socially transmitted knowledge.

2026 Human evolution is a product of both biological and cultural factors. Elaborate. 2026 Discuss the phylogenetic status, characteristic features, geographical distribution and lifeways of Paranthropus. 2026 What are Strepsirhini Primates? Describe their geographical distribution and mention the characteristics that distinguish them from Haplorhini Primates. 2026 Seed Eaters Model of hominid differentiation.

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UPSC Anthropology Optional 2015 — Paper I

28 questions

1(a) Archaeological Anthropology.

10 Marks150 words
Syllabus: Paper I > 1.3 Main branches of Anthropology > Archaeological Anthropology
2015Paper IFoundations of AnthropologyModel answer available

5(e) DNA technology in Medicine.

10 Marks150 words
Syllabus: Paper I > 12. Applications of Anthropology > DNA technology in diseases and medicine
2015Paper IApplied & Forensic AnthropologyModel answer available

5(b) Down's Syndrome.

10 Marks150 words
Syllabus: Paper I > 9.4(c) Autosomal aberrations > Down syndrome
2015Paper IHuman Genetics & Human BiologyModel answer available

1(e) Historical Particularism.

10 Marks150 words
Syllabus: Paper I > 6. Anthropological Theories > Historical Particularism (Boas)
2015Paper IAnthropological TheoriesModel answer available

1(d) Horticulture.

10 Marks150 words
Syllabus: Paper I > 3. Economic Organization > Modes of subsistence > Horticulture
2015Paper IEconomic & Political AnthropologyModel answer available

1(c) Incest Taboos.

10 Marks150 words
Syllabus: Paper I > 2.3 Marriage > Rules of marriage > Incest taboo
2015Paper IMarriage & FamilyModel answer available

5(c) Longitudinal method of studying growth.

10 Marks150 words
Syllabus: Paper I > 10. Human growth and development > Methodologies for growth studies > Longitudinal method
2015Paper IHuman Genetics & Human BiologyModel answer available

5(d) Menopause and its impact.

10 Marks150 words
Syllabus: Paper I > 11.1 Relevance of menarche, menopause and other bio-events to fertility
2015Paper IHuman Genetics & Human BiologyModel answer available

5(a) Palaeolithic culture.

10 Marks150 words
Syllabus: Paper I > 1.8(b) Cultural Evolution: broad outlines of prehistoric cultures > Palaeolithic
2015Paper IPrehistoric ArchaeologyModel answer available

1(b) Society and Culture.

10 Marks150 words
Syllabus: Paper I > 2.2 The Nature of Society > Society and culture
2015Paper ICulture & SocietyModel answer available