Revision summary
Genealogy is Rivers’ 1910 method: social ties, kin terms, marriage and rights. Fictive kin count. Pedigree is a genetic diagram of biological parentage and affected status, used to infer Mendelian inheritance. The two words are not synonyms. History runs from Cambridge field kinship on one side to clinical and then medical genetics on the other. Uses include kinship systems, consanguinity, counselling, and careful overlay with consent. Alliance theory criticised genealogy-as-enough. It did not erase the method.
Model answer
Introduction
Genealogy and pedigree both draw links between persons across generations, but they are not the same tool. Genealogy in social anthropology maps socially recognised ties. Pedigree in genetics maps biological descent and trait transmission. Mixing the two words hides a real difference in what is being mapped.
Body
The distinction
Genealogical analysis is W. H. R. Rivers’ field method (1910). The ethnographer elicits who is called what, who marries whom, and who inherits. The object is the social system: descent, alliance, residence and rights. Fictive kin, adoption and term-use belong on the chart because they are socially real.
Pedigree analysis is a biomedical diagram of biological parentage. Standard symbols — squares, circles, shading for affected status — help infer Mendelian modes such as autosomal dominant, recessive, X-linked or mitochondrial. The object is the path of a genotype, not the kinship vocabulary.
A mother’s brother on a genealogy is a jural person. On a pedigree he is a node who may or may not carry an allele. You can overlay the two in the field. You must not collapse them.
History
Rivers developed genealogy after the Torres Strait expedition to make kinship comparable and to escape impressionistic tribal sketches. The method organised African, Indian and Pacific ethnography. Lewis Henry Morgan had already collected kin terms, but Rivers turned relatedness into a systematic interview.
Pedigree thinking is older in Francis Galton’s family studies and in clinical medicine. It later became the everyday tool of medical genetics. Anthropology’s biological wing took pedigrees into population genetics and genetic counselling. The social wing kept Rivers’ charts even while alliance theory criticised descent-chart fetishism. Needham’s Purum work is part of that later caution: a genealogy is not the whole kinship system.
Applications
- Social anthropology: Reconstruct lineage politics, marriage rules and inheritance disputes. Check whether practice matches the stated rule.
- Biological and medical anthropology: Recessive disease clustering, consanguinity and genetic load, and counselling. South Indian uncle–niece or cousin marriage, or disease clusters in small endogamous groups, are standard applications. Pedigrees are how Mendelian traits in humans are demonstrated.
- A contemporary complication: Direct-to-consumer DNA tests and disputed paternity can contradict both stated genealogy and assumed biological parentage.
- Ethics: Collecting pedigrees in a small community can stigmatise. Informed consent and anonymisation are part of the method now.
Flow diagram
flowchart TD G[Genealogy] --> S[Social kinship / Rivers] P[Pedigree] --> M[Mendelian genetics] G --> A[Alliance, descent, terms] P --> D[Disease and counselling]
Conclusion
Genealogy asks how relatedness is organised as a social fact. Pedigree asks how a trait travels as a biological fact. Anthropology uses both, on different questions. The difference comes first; the applications follow from it.
Quick related
Students also ask
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What is mixed-longitudinal method of studying human growth. Discuss its merits and demerits.
Next question on this syllabus topic (2023 · Q3(c)). View answer →
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Can one chart serve both?
Both can be collected from one household. They must be recoded: social terms versus biological parentage and phenotype. Two analyses, possibly one notebook.
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Where does DNA testing sit?
Molecular kinship can contradict both stated genealogy and assumed paternity. It is a contemporary complication, not the whole history of either method.
PYQ trend
When UPSC asked this
Related PYQs from other years, newest first. Open a question to read it.
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2023 · Q3(c) · Anthropology GS 1 · 15 marks
What is mixed-longitudinal method of studying human growth. Discuss its merits and demerits. -
2016 · Q7(a) · Anthropology GS 1 · 20 marks
Critically discuss the Mendelian principles and their application to human populations.
More from this topic
Q3(c) · UPSC Mains 2023 · Anthropology GS 1 · 15 marks
What is mixed-longitudinal method of studying human growth. Discuss its merits and demerits.
Human Genetics
Cross-sectional study measures different children once. Longitudinal study remeasures the same children, as in Tanner’s work. Mixed-longitudinal study follows overlapping cohorts and may replace drop-outs. Merits are cost, speed, and some velocity data. Demerits are joining error, secular-trend mix, and remaining attrition bias. Indian school and ICMR work often uses this middle design.
Q7(a) · UPSC Mains 2016 · Anthropology GS 1 · 20 marks
Critically discuss the Mendelian principles and their application to human populations.
Human Genetics
Segregation and independent assortment are the core Mendelian laws. Human pedigrees of recessives, dominants, and X-linked traits apply them. Hardy–Weinberg is Mendelism at population scale. Consanguinity and caste mating violate random-mating assumptions. Polygenic traits and eugenic history are the critique.
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