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Home/Anthropology/Mains PYQ/2017/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2017 15 Marks Model Answer Available

Methods of Studying Growth — 2017 Paper I

Question · 2017 · Paper I · 15 Marks

Describe the various methods of studying growth highlighting their merits and demerits.

Model Answer

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Approach

  • Demand of Question:Describe the principal study designs used in human growth research and compare their strengths and weaknesses.
  • Structuring the Response:Define growth study; discuss longitudinal, cross-sectional and mixed-longitudinal designs; explain what each reveals about distance and velocity; conclude with design choice.
  • Key Dimensions to Cover:Tanner; longitudinal, cross-sectional and mixed-longitudinal methods; cohort effects; attrition; tempo and velocity of growth; cost and duration.

Model Answer

Introduction Human growth is the progressive change in body size, proportions, and maturation. Because growth spans roughly two decades, anthropologists use specific study designs to collect anthropometric data. The choice of method dictates whether the researcher captures population averages (distance curves) or individual growth rates (velocity curves).

Body

  1. Cross-Sectional MethodDifferent individuals of different age groups are measured onceat the same point in time. (e.g., Measuring a different set of 5-year-olds, 6-year-olds, and 7-year-olds all in the year 2026).
  • Merits:
    • Time and Cost Efficient: Data can be collected rapidly.
    • Large Sample Sizes: Easy to recruit participants, allowing for statistically robust population standards (e.g., WHO growth charts).
    • Distance Curves: Ideal for plotting "distance curves" (average height attained at a specific age).
  • Demerits:
    • Cannot Track Velocity: It fails to show individual growth rates or the exact timing of the adolescent growth spurt.
    • Cohort Effects: Differences between age groups might reflect secular trends (e.g., better nutrition over the last decade) rather than pure growth.
  1. Longitudinal MethodThe sameindividuals are measured repeatedly over a long period (e.g., J.M. Tanner’s classic studies tracking the same group of children every year from birth to 20 years of age).
  • Merits:
    • Captures True Velocity: Perfectly illustrates individual growth trajectories, the exact onset of puberty, and peak height velocity (PHV).
    • Eliminates Cohort Effects: Since the exact same individuals are tracked, generational environmental shifts do not skew the data.
  • Demerits:
    • High Cost and Time: Requires immense funding and takes decades to complete.
    • Subject Attrition: Participants may drop out, move away, or die, drastically reducing the final sample size.
    • Observer Error: Over 20 years, measuring equipment or personnel might change, introducing bias.
  1. Mixed-Longitudinal (Linked-Cross-Sectional) MethodA hybrid approach. Several overlapping age cohorts are followed for a short, specific period. (e.g., Group A is tracked from age 0-5; Group B from 4-9; Group C from 8-13. The data is then stitched together).
  • Merits:
    • Best of Both Worlds: Provides information on both distance (population averages) and velocity (individual rates).
    • Time-Saving: A 20-year growth span can be comprehensively studied in just 5 years.
    • Reduces Attrition: Shorter commitment time for participants.
  • Demerits:
    • Methodological Complexity: Requires highly sophisticated statistical adjustments to smoothly link the overlapping cohorts, as different cohorts may have different socioeconomic backgrounds.

Conclusion No single method is universally superior. Cross-sectional studies are best for public health monitoring and creating national standards. Longitudinal studies remain the gold standard for understanding the biological tempo of human maturation, while mixed-longitudinal provides the most practical, cost-effective compromise for modern researchers.

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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