(a) Chronometric dating (b) Cultural relevance of the Kula (c) Heritability and its estimation (d) Authority and forms of…

(a) Chronometric Dating Chronometric (absolute) dating gives an age in years, with a margin of error, to a sample, site or layer, unlike relative dating (stratigraphy, typology, fluorine analysis), which only places things in sequence. Most methods rely on a process that runs at a known, constant rate from a known starting point, usually radioactive decay (N = N₀e^(−λt), with half-life t½ = 0.693/λ).

• Radiocarbon (C-14): living organisms keep the atmospheric level of ¹⁴C; after death it decays with a half-life of 5,730 years. Measuring the remaining ¹⁴C in charcoal, bone or shell (by beta counting or, with tiny samples, accelerator mass spectrometry) gives an age back to about 50,000 years. Because atmospheric ¹⁴C has varied, dates are calibrated against tree rings and other records (IntCal curve). It has dated Mehrgarh, Neolithic Burzahom and Chalcolithic Inamgaon.
• Potassium–argon and argon–argon: these date volcanic rocks from the decay of ⁴⁰K to ⁴⁰Ar (half-life about 1.25 billion years), and suit East African hominin sites such as Olduvai; in India they have been applied to volcanic ash layers such as the one at Bori (Maharashtra).
• Luminescence (TL and OSL): these measure the radiation dose trapped in minerals since they were last heated (pottery, burnt flint) or exposed to sunlight (sediments). OSL dated Middle Palaeolithic tools below and above the Youngest Toba Tuff (about 74,000 years) at Jwalapuram, Andhra Pradesh.
• ESR, uranium-series and cosmogenic nuclide dating: these date teeth, cave deposits and buried sediments. Cosmogenic ²⁶Al/¹⁰Be burial dating placed the Acheulian at Attirampakkam (Tamil Nadu) at about 1.5 million years.
• Others: dendrochronology, palaeomagnetism and fission-track dating. Chronometric dates allow archaeologists to compare sequences across regions and measure rates of cultural and biological change.

(b) Cultural Relevance of the Kula The Kula, described by Bronislaw Malinowski in Argonauts of the Western Pacific (1922) from his fieldwork in the Trobriand Islands (1915–18), is a ceremonial exchange linking a ring of islands off eastern New Guinea.

• Valuables: long necklaces of red shell discs (soulava or veigun) travel clockwise around the ring, and white armshells (mwali) travel anticlockwise. Each is exchanged only for the other between lifelong Kula partners, after a delay, amid ceremony and magic. Valuables are not kept permanently; their fame grows with the names of those who held them.
• Not barter: alongside the Kula, ordinary goods are traded by haggling (gimwali), which the Kula itself forbids. This showed that "primitive" economies were not driven by simple utility, and that economic acts are embedded in social relations.
• Social functions: the Kula creates alliances and safe passage between islands, organises canoe-building, magic and leadership, and brings prestige to chiefs and big players who attract famous valuables.
• Theoretical influence: Malinowski used it to show the integration of economy, politics, magic and myth (functionalism). Marcel Mauss (The Gift, 1925) built his theory of the obligation to give, receive and return on it, and later economic anthropology debated reciprocity (Polanyi, Sahlins).
• Critique and change: Annette Weiner (1976) showed that Malinowski neglected women's exchanges of banana-leaf bundles and skirts and the principle of "keeping-while-giving". The Kula continues today, adapted to money, boats and new valuables.

(c) Heritability and its Estimation Heritability is the proportion of phenotypic variance (V_P) of a trait in a given population that is due to genetic differences, where V_P = V_G + V_E.

• Broad-sense heritability H² = V_G / V_P includes additive, dominance and epistatic effects.
• Narrow-sense heritability h² = V_A / V_P includes only additive variance, and predicts the response to selection (R = h²S). Heritability describes a population in a particular environment, not an individual, and high heritability does not mean a trait cannot change: average height rose sharply over the 20th century though its heritability is about 0.8.

Methods of estimation

• Twin studies: monozygotic twins share all their genes and dizygotic twins about half, so for quantitative traits Falconer's formula gives h² ≈ 2(r_MZ − r_DZ). For discrete traits, concordance rates are compared, for example with Holzinger's H = (C_MZ − C_DZ)/(100 − C_DZ).
• Twins reared apart and adoption studies: the correlation of separated MZ twins (for example the Minnesota Study of Twins Reared Apart) directly estimates H², and resemblance of adoptees to biological versus adoptive parents separates genes from environment.
• Parent–offspring regression: the slope of offspring on mid-parent value estimates h², and on a single parent estimates h²/2. Sib correlations are also used.
• Genomic methods: these estimate heritability from shared DNA among unrelated people (SNP heritability). Limitations: twins may share more environment than DZ pairs (the equal-environments assumption), and gene–environment interaction and correlation complicate estimates.

(d) Authority and Forms of Political Organisation Power is the ability to make others act; authority is power accepted as legitimate. Max Weber distinguished three types: traditional authority (a chief or elder obeyed because of custom), charismatic authority (a prophet or leader obeyed for personal qualities, such as Birsa Munda among the Mundas), and legal-rational authority (office-holders obeyed under impersonal rules, as in the modern state).

Forms of political organisation (Elman Service; Morton Fried's egalitarian, rank and stratified societies):

• Band: small, mobile, egalitarian foragers; leadership is informal and based on age and skill, and decisions are reached by consensus (for example the San, and the Birhor and Chenchu in India).
• Tribe: larger food-producing groups linked by clans, lineages and age-sets without central authority, what Fortes and Evans-Pritchard (African Political Systems, 1940) called acephalous societies, such as the Nuer with their segmentary lineages. Melanesian big-men win influence by generosity and persuasion rather than office (Sahlins, 1963), and many Naga villages have councils of elders.
• Chiefdom: ranked societies with a hereditary chief who redistributes goods and holds sacred authority, such as Polynesian chiefdoms, or in India the Konyak Naga Ang and the Khasi syiem ruling a hima.
• State: a centralised government with a monopoly of legitimate force, taxation, bureaucracy and law over a territory, as in the Mauryan and later Indian kingdoms and the modern state. In India, tribal councils and customary law (recognised, for example, under the Sixth Schedule and PESA, 1996) coexist with the legal-rational authority of the constitutional state.

(e) Single-Gene Mutation Disorders in Man Single-gene (monogenic, Mendelian) disorders are caused by a mutation in one gene and follow Mendelian patterns of inheritance. Individually rare, together they affect about 1% of births.

• Autosomal dominant: one mutant copy suffices; an affected parent passes it to half the children. Examples are Huntington's disease, achondroplasia, Marfan syndrome and familial hypercholesterolaemia.
• Autosomal recessive: two copies are needed; carrier parents have a 1 in 4 risk per pregnancy, and consanguinity (common in parts of South India and some communities) raises the risk. Examples are sickle cell disease and β-thalassaemia (mutations in the HBB gene), albinism, phenylketonuria, cystic fibrosis (rarer in Indians) and Tay-Sachs disease.
• X-linked recessive: mainly affects males, transmitted through carrier mothers. Examples are haemophilia A and B, Duchenne muscular dystrophy, G6PD deficiency (common in India) and red-green colour blindness.
• X-linked dominant: for example vitamin D-resistant (hypophosphataemic) rickets.
• Mitochondrial: single-gene mtDNA disorders such as Leber's hereditary optic neuropathy pass only through mothers.

Indian context: β-thalassaemia carrier rates of about 3–4% overall are higher among Sindhis, Punjabis, Gujaratis (such as the Lohanas), Bengalis and Parsis, while sickle cell disease is concentrated among tribal communities of central, western and southern India (such as Gond, Bhil and Pawara). Prevention relies on carrier screening, genetic counselling and prenatal diagnosis, under the National Health Mission's guidelines on haemoglobinopathies and the National Sickle Cell Anaemia Elimination Mission (2023).