(a) What is acclimatization? Discuss adaptive responses to high altitude and cold climate. (20 marks) (b) How are the cases of…

Acclimatization and Kinship: Physiological and Social Adaptations

Acclimatization refers to the physiological adjustments an individual undergoes in response to environmental stressors, distinct from genetic adaptation which occurs over generations. In high-altitude environments, the primary challenge is hypoxia. The immediate response is the hypoxic ventilatory response, increasing breathing rate to boost oxygen intake. Over weeks, the body produces erythropoietin, stimulating red blood cell production (polycythemia) to enhance oxygen-carrying capacity. Concurrently, the affinity of hemoglobin for oxygen decreases via increased 2,3-DPG, facilitating oxygen release to tissues. Long-term acclimatization involves increased capillary density in muscles. Genetically, populations like the Tibetans and Andeans show distinct adaptations; Tibetans possess EPAS1 mutations allowing efficient oxygen use without excessive polycythemia, a pattern observed in Himalayan groups like the Lahaul-Spiti and Sikkimese. In cold climates, thermoregulation relies on peripheral vasoconstriction to conserve heat and shivering thermogenesis. Non-shivering thermogenesis utilizes brown adipose tissue. Morphological adaptations, though genetic, follow Bergmann’s rule (larger body size in colder regions) and Allen’s rule (shorter limbs), seen in the Gaddi shepherds and Brokpa communities of the Himalayas.

Resolving Disputed Paternity

Historically, paternity disputes were resolved using serological markers such as ABO blood groups, the MN system, and serum protein polymorphisms. While these systems could exclude a man as the father with high probability, their power of exclusion was limited compared to modern methods. When High Resolution Antigen (HLA) typing was introduced, the combined power of exclusion approached or exceeded 99%, allowing for high probabilities of paternity, though not absolute certainty. The advent of DNA profiling, pioneered by Alec Jeffreys, revolutionized this field. Short Tandem Repeat (STR) analysis is the current gold standard, examining highly polymorphic loci. The Paternity Index (PI) for each locus is multiplied to yield the Combined Paternity Index (CPI), which quantifies the likelihood of paternity relative to a random man. Y-chromosome and mitochondrial DNA testing further assist in lineage verification. In India, these tests are admissible under the Indian Evidence Act, 1872, specifically Section 45 (expert opinion) and Section 164 (examination of accused), provided strict chain-of-custody protocols are maintained to ensure legal validity.

Critique of Lewis Morgan’s Family Classification

Lewis Morgan’s Ancient Society proposed a unilineal evolutionary sequence of family forms: consanguine, punaluan, syndyasmian, patriarchal, and monogamous. He argued that the monogamous family, the final stage, was founded on property rights and male supremacy, marking the transition from savagery to civilization. This scheme was deeply influential, shaping Marx and Engels’ materialist interpretation of history. However, it has been heavily critiqued. Bronislaw Malinowski argued that Morgan relied on "survivals" in modern societies to reconstruct past stages, a methodological flaw that ignored the dynamic nature of social institutions. A.R. Radcliffe-Brown, from a functionalist perspective, criticized the teleological assumption that all societies progress through identical stages, noting that family structures are adapted to specific ecological and social needs rather than following a universal ladder. W.H.R. Rivers’ kinship studies further undermined Morgan’s claims by demonstrating the complexity and diversity of kinship terminologies that did not fit neatly into Morgan’s categories.

Conclusion

While Morgan’s work was historically significant in establishing the study of kinship and influencing social theory, his unilineal evolutionary model is now rejected. Contemporary anthropology recognizes the diversity of family forms and the complex interplay of biology, culture, and environment. The study of physiological acclimatization and the legal resolution of paternity via DNA both highlight how scientific precision has replaced speculative evolutionary narratives, allowing for a more nuanced understanding of human adaptation and social organization.