The complete guide to forensic biology, body-fluid identification, hair and fibre microscopy, entomology, wildlife forensics, and the full DNA pipeline — for the NFSU FACT and UGC-NET Forensic Science exams.
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Forensic biology is the source-attribution arm of forensic science. Its job is to answer the who question: which person did this fluid come from, which species did this hair originate from, which animal did this bone belong to. The classical disciplines (serology, microscopy, entomology) have been joined since the 1980s by molecular biology, and DNA profiling has reshaped the field — but body-fluid identification, hair and fibre comparison, and species ID remain the foundations.
For an Indian forensic-science student the breadth matters. CFSL and state FSLs maintain biology divisions that handle sexual-assault casework (serology + DNA), homicide (post-mortem interval from entomology, identity from anthropology + DNA), and wildlife crime under the Wildlife Protection Act. Each stream has its own protocols, instruments, and reporting standards. The exam tests breadth more than depth — but you need both.
FACT splits the biology section into eight units mapping to NFSU's MSc curriculum. The DNA-pipeline blocks are weighted heaviest, but every unit appears on every recent paper.
Presumptive and confirmatory tests for blood, semen, saliva, vaginal fluid and urine — the chain a serologist works through before a swab goes for DNA extraction.
Optical microscopy of class characteristics, plus instrumental confirmation (FTIR, Raman, polarised-light) for fibre polymer ID.
Sample-prep workflows (organic, Chelex, magnetic-bead) for blood / semen / bone / hair, plus qPCR-based quantitation before amplification.
Short-tandem-repeat amplification, capillary electrophoresis, allele calling, and the maths of match probability + likelihood ratio.
Mitochondrial sequencing for degraded samples and the maternal-line trace; Y-STR profiling for male-mixture deconvolution and paternal-line analyses.
Insect succession on a corpse and accumulated degree-days for post-mortem-interval estimation.
CITES-listed species identification from hair, horn, ivory, scales, meat samples, and the law that backs Indian wildlife casework.
Skeletal remains identification — sex, age, ancestry, stature — from bones and bone fragments.
Forensic biology is ~18–20 marks on a 100-question FACT paper. The DNA-pipeline questions are usually scenario-based: given this evidence type and degradation state, which extraction method, which quant kit, which marker system. The body-fluid unit tests presumptive-confirmatory chains. Hair / fibre questions are class-vs-individual recognition. Entomology questions reduce to ADD calculations or succession ID.
For UGC-NET Forensic Science the same pipeline appears with heavier theory loading — population-genetics calculations, paternity-index maths, mixture-deconvolution likelihood ratios, and history-of-the-discipline (Jeffreys 1985, Pitchfork case) questions. The instrumentation overlap is ~80% with FACT.
Presumptive and confirmatory tests for blood, semen, saliva, vaginal fluid and urine — the chain a serologist works through before a swab goes for DNA extraction.
Optical microscopy of class characteristics, plus instrumental confirmation (FTIR, Raman, polarised-light) for fibre polymer ID.
Sample-prep workflows (organic, Chelex, magnetic-bead) for blood / semen / bone / hair, plus qPCR-based quantitation before amplification.
Short-tandem-repeat amplification, capillary electrophoresis, allele calling, and the maths of match probability + likelihood ratio.
Mitochondrial sequencing for degraded samples and the maternal-line trace; Y-STR profiling for male-mixture deconvolution and paternal-line analyses.
Insect succession on a corpse and accumulated degree-days for post-mortem-interval estimation.
CITES-listed species identification from hair, horn, ivory, scales, meat samples, and the law that backs Indian wildlife casework.
Skeletal remains identification — sex, age, ancestry, stature — from bones and bone fragments.