Revision summary
Jeffreys’s DNA fingerprinting and STR databases serve courts and disaster victim identification. PCR is the workhorse of pathogen testing, including COVID-19. Medical uses include screening, pharmacogenomics, and early gene editing. Pääbo’s aDNA methods serve prehistory, including Indian Harappan genomes. GM crops and wildlife barcoding are agrarian and forensic ecological uses. Consent and over-reading ancestry as race remain anthropological limits.
Model answer
Introduction
DNA technology reads, copies, and sometimes edits genetic material. Its current practical uses run from courts and clinics to farms, ancestry, and pandemic tests.
Body
Identification and kinship
- Alec Jeffreys introduced DNA fingerprinting in 1984; STR profiles now identify suspects, exonerate the wrongfully accused, and match disaster victims when a reference exists.
- Paternity and immigration kinship tests use the same markers, which forensic anthropology now pairs with bone profiles.
- Databases such as national crime indexes raise liberty questions that anthropology of the state must notice.
Medicine and public health
- PCR, associated with Kary Mullis, underpins pathogen tests, including the COVID-19 diagnostic wave.
- Carrier screening, prenatal tests, BRCA and other risk panels, and pharmacogenomics tailor drugs to genotype.
- Gene therapy and CRISPR editing, after Doudna and Charpentier, are entering clinics for a few monogenic diseases, with ethics still contested.
Ancestry, ancient DNA, and population study
- Svante Pääbo’s ancient DNA methods reconstruct archaic admixture and prehistoric movement, as in Neanderthal genomes and South Asian aDNA from sites such as Rakhigarhi.
- Commercial ancestry tests are popular and often over-interpreted as race.
Food, environment, and industry
- GM crops, DNA barcoding of wildlife for poaching cases, and GMO labelling disputes are applied molecular biology in the agrarian and conservation field.
- Recombinant insulin and vaccines are older industrial applications that still matter.
Anthropological caution
- DNA can name a body and still not name a culture.
- Consent, caste politics of sampling, and the return of results to indigenous groups are part of current practice, not extras.
Flow diagram
flowchart TD DNA[DNA technology] --> F[Forensic kinship] DNA --> M[Medicine PCR CRISPR] DNA --> A[Ancient DNA ancestry] DNA --> G[GM barcoding]
Conclusion
DNA technology now identifies persons, diagnoses infection and risk, edits a few diseases, and reconstructs prehistory. The current scenario is laboratory power plus consent and interpretation, not a code that replaces society.
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