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Home/Anthropology/Mains PYQ/2017/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2017 20 Marks Model Answer Available

Methods Used in the Genetic Study of Man — 2017 Paper I

Question · 2017 · Paper I · 20 Marks

Briefly describe the various methods used in the genetic study of man.

Model Answer

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Approach

  • Demand of Question:Describe the principal classical and modern methods used to investigate human heredity and population genetic variation.
  • Structuring the Response:Move from family/pedigree and twin methods to population, cytogenetic, biochemical and molecular approaches; explain what each reveals and its limitations.
  • Key Dimensions to Cover:Pedigree; twin/adoption; population genetics; Hardy-Weinberg; cytogenetics/karyotyping; blood groups and proteins; DNA markers, STRs, SNPs, sequencing, GWAS and ancient DNA; ethical caution.

Model Answer

Introduction Unlike plants or animals, humans cannot be subjected to controlled breeding experiments due to ethical constraints, long generation times, and small family sizes. Therefore, physical anthropologists and geneticists rely on a combination of classical, cytogenetic, and modern molecular methods to study human heredity and variation.

Body

  1. Classical / Family-Based Methods
  • Pedigree Analysis: Tracing a specific trait or disease through multiple generations of a family using standard symbols. It helps determine the mode of inheritance (e.g., Autosomal Dominant for Huntington's disease, X-linked recessive for Hemophilia).
  • Twin and Adoption Studies: Used to determine the heritability of a trait (nature vs. nurture). By comparing Monozygotic (identical) twins and Dizygotic (fraternal) twins—especially those reared apart in different environments—researchers can estimate the relative contribution of genetics versus environment to complex traits like IQ or height.
  1. Cytogenetic Methods
  • Karyotyping: The visual examination of chromosomes under a microscope during cell division (metaphase). It identifies numerical abnormalities (e.g., Trisomy 21 / Down Syndrome) and large structural chromosomal translocations.
  • FISH (Fluorescence In Situ Hybridization): A higher-resolution technique that uses fluorescent probes to detect specific micro-deletions or duplications on chromosomes that standard karyotyping might miss.
  1. Biochemical and Immunological Methods
  • Before the DNA era, geneticists studied the products of genes. This includes mapping the distribution of blood groups (ABO, Rh, MN), serum proteins, and Human Leukocyte Antigens (HLA). These were historically crucial for studying population migration, racial affinities, and paternity testing.
  1. Population Genetics Method
  • This method studies allele and genotype frequencies in a large population over time. Using the Hardy-Weinberg Principle as a baseline, anthropologists can measure the impact of evolutionary forces (mutation, natural selection, genetic drift, and gene flow) on human populations.
  1. Modern Molecular and Genomic Methods
  • DNA Markers (SNPs and STRs): Short Tandem Repeats (STRs) and Single Nucleotide Polymorphisms (SNPs) are used for high-precision DNA fingerprinting, forensic identification, and tracing deep human ancestry (Y-chromosome for paternal lineages, mtDNA for maternal lineages).
  • GWAS (Genome-Wide Association Studies): Scans the entire genome of thousands of individuals to find genetic variations associated with complex, polygenic diseases (e.g., diabetes, schizophrenia).
  • Paleogenomics (Ancient DNA): The extraction and sequencing of DNA from archaeological remains (e.g., Neanderthals, Denisovans). This has revolutionized our understanding of ancient human migrations and interbreeding.

Conclusion The genetic study of humans has transitioned from simple observational pedigrees to high-resolution whole-genome sequencing. However, the most robust anthropological studies do not view genes in isolation; they integrate molecular data with archaeology, paleoecology, and social history to understand the complete biocultural human story.

2026 Genetic polymorphism and natural selection. 2026 Numerical chromosomal aberrations can be due to abnormalities in autosomes as well as sex chromosomes. Elaborate in terms of the effects these have on human body, giving suitable examples. 2026 Distinguishing features of nuclear and mitochondrial DNA. 2026 How would you find out that a particular disease/disorder is inherited and, if so, in which manner? Elaborate with suitable examples.

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UPSC Anthropology Optional 2017 — Paper I

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