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Home/Anthropology/Mains PYQ/2026/Paper I/Human Genetics & Human Biology
UPSC MainsAnthropology Optional Paper I 2026 15 Marks Model Answer Available

Serogenetics, Cytogenetics and Ethics in Reproductive Technology — 2026 Paper I

Question · 2026 · Paper I · 15 Marks

In what manner is our understanding of serogenetics and cytogenetics useful in reproductive biology? What are the major ethical issues involved in reproductive technology?

Model Answer

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Approach

  • Demand of Question: Explain the uses of serogenetics and cytogenetics in reproductive biology and critically discuss ethical issues in reproductive technology.
  • Structuring the Response: Define both → serogenetic/Rh applications → cytogenetic infertility/prenatal applications → reproductive-technology ethics → conclusion.
  • Key Dimensions to Cover: ABO/Rh, anti-D prophylaxis, karyotyping, aneuploidy/translocations, embryo selection, privacy, surrogacy, inequality and germline editing.

 

Model Answer

Introduction: Serogenetics studies inherited variation in blood-group and serum markers, while cytogenetics examines chromosome number, Answer structure and Flow and behaviour. Both have made major contributions to reproductive biology, although contemporary molecular genetics now supplements many classical applications.

Serogenetics in reproductive biology:

  • ABO, Rh and other red-cell antigen systems helped establish Mendelian inheritance and historically assisted parentage exclusion.
  • The most important reproductive application is maternal–fetal blood-group incompatibility. An RhD-negative mother carrying an RhD-positive fetus may become sensitised and produce IgG anti-D antibodies. These can cross the placenta in a subsequent susceptible pregnancy and cause haemolytic disease of the fetus/newborn.
  • Serological screening and anti-D immunoprophylaxis therefore have direct preventive importance.
  • Blood-group and serum-protein polymorphisms also contributed historically to population/reproductive genetics and genetic counselling.

Cytogenetics in reproductive biology:

  • Karyotyping and related chromosome-based tests detect aneuploidies and structural rearrangements relevant to infertility, recurrent pregnancy loss and prenatal diagnosis.
  • Examples include trisomy 21, Turner syndrome, Klinefelter syndrome and balanced translocations in clinically normal parents that may generate unbalanced gametes.
  • Cytogenetic findings inform genetic counselling and, where clinically justified, may guide reproductive decision-making and embryo testing.

Major ethical issues in reproductive technology:

  • informed consent and counselling under uncertainty;
  • privacy and future use of reproductive/genetic data;
  • moral status, storage, research use and disposal of embryos;
  • embryo selection, disability concerns and possible eugenic tendencies;
  • non-medical sex/trait selection;
  • donor anonymity, parentage and the future child’s interest in genetic origins;
  • commercialisation of gametes and possible exploitation in surrogacy;
  • unequal access to expensive technologies;
  • heritable genome editing, off-target risk and absence of consent from future generations.

Conclusion: Serogenetics made reproductive inheritance and blood-group compatibility visible, while cytogenetics made chromosome-level reproductive risk diagnosable. As reproductive intervention becomes more powerful, biological capability must be balanced by autonomy, justice, non-exploitation and intergenerational responsibility.

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. 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.

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