VAID'S ICS – Best UPSC Anthropology Coaching in Delhi Since 1985

Comprehensive Classroom Course · Admissions openRegister now
+91 93113 37737
  • +91-93113 37737, +91-99999 46748
  • 73(FF), Old Rajender Nagar Market, Delhi - 110060
  • MON to SUN 9.00 am - 6.00 pm
Facebook Youtube Instagram
Menu
Enquire Now
Home/Anthropology/Mains PYQ/2025/Paper I/Human Evolution & Primatology
UPSC MainsAnthropology Optional Paper I 2025 10 Marks Model Answer Available

Mitochondrial DNA and Human Evolution — 2025 Paper I

Question · 2025 · Paper I · 10 Marks

Mitochondrial DNA and human evolution.

Model Answer

VAID ICS

Introduction Mitochondrial DNA (mtDNA) is a small, circular genome located in the mitochondria of cells. Unlike nuclear DNA, mtDNA is strictly maternally inherited, does not undergo recombination, and has a relatively fast, predictable mutation rate. These unique properties make it an excellent "molecular clock" to trace human evolutionary history and migrations.

Evolutionary Significance of mtDNA

  1. The "Out of Africa" Theory and Mitochondrial Eve
  • In 1987, geneticists Rebecca Cann, Mark Stoneking, and Allan Wilson analyzed mtDNA from global populations.
  • They discovered that modern humans exhibit the greatest mtDNA diversity in Africa, indicating that African lineages are the oldest.
  • Using the molecular clock, they traced all living humans back to a single common maternal ancestor—dubbed "Mitochondrial Eve"—who lived in East Africa approximately 150,000 to 200,000 years ago, strongly supporting the Recent African Origin model over the Multiregional hypothesis.
  1. Tracking Global Migrations (Haplogroups)
  • As groups migrated out of Africa, their mtDNA accumulated specific mutations, creating distinct lineages called haplogroups.
  • For example, macro-haplogroup L is restricted to Africa, while haplogroups M and N represent the pioneer populations that migrated out of Africa to populate Eurasia, Australasia, and the Americas.
  1. Discovering and Comparing Archaic Hominins
  • Pioneered by Nobel Laureate Svante Pääbo, the extraction of ancient mtDNA (aDNA) revolutionized paleoanthropology.
  • mtDNA from Neanderthal fossils proved they were a distinct lineage that diverged from modern humans ~500,000 years ago.
  • The Denisovans were discovered entirely through genetics; their existence was first identified by sequencing the unique mtDNA from a tiny finger bone found in Denisova Cave, Siberia.

Limitations

  • Single Lineage: mtDNA only traces the direct maternal line, ignoring the vast genetic history contributed by fathers (which requires Y-chromosome and autosomal DNA analysis).
  • Lineage Extinction: Due to genetic drift, many ancient mtDNA lineages have died out simply because a mother only had sons, skewing the evolutionary picture.

Conclusion The study of mitochondrial DNA birthed the field of molecular anthropology. By complementing the fossil record with genetic data, mtDNA has provided a precise and verifiable timeline of human origins, inter-species relationships, and ancient global migrations.

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.

Want feedback on your answer?

Join the Anthropology workshop or get structured answer-writing guidance from VAID ICS.

Join Workshop Contact VAID ICS

UPSC Anthropology Optional 2025 — Paper I

28 questions

1(e) Culture and embodiment.

10 Marks150 words
Syllabus: Paper I > Nature of Culture > Contemporary Culture Concepts > Embodiment; body and culture
2025Paper ICulture & SocietyModel answer available

1(a) Mendelian and non-Mendelian traits.

10 Marks150 words
Syllabus: Paper I > Human Genetics > Mendelian Genetics in Man > Mendelian and non-Mendelian inheritance
2025Paper IHuman Genetics & Human BiologyModel answer available

1(c) Osteodontokeratik culture and its makers.

10 Marks150 words
Syllabus: Paper I > Prehistoric Archaeology > Early Tool Traditions > Osteodontokeratic culture; australopithecine makers
2025Paper IPrehistoric ArchaeologyAnswer coming soon