Forensic laboratory: DNA fingerprinting, toxicological analysis
Forensic Medicine and Toxicology · MBBS
DNA double helix
Interactive 3DThe twisted ladder of life — A–T and G–C base pairs winding 10 per turn.
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Study notes
One full turn of the DNA helix spans 10 base pairs and rises 3.4 nm, so each base pair adds 0.34 nm. A human chromosome with 100 million base pairs would stretch about 3.4 cm if unwound — yet it packs into a nucleus only micrometres wide, wound around histone proteins. A always pairs with T (2 hydrogen bonds) and G with C (3 hydrogen bonds) — which is why the two strands are complementary.
Related topics
- Legal procedures: inquest, courts, medical evidence
- Medical jurisprudence: consent, negligence, medical records
- Thanatology: death — types, signs, postmortem changes
- Autopsy: procedure, exhumation, artifacts
- Injuries: mechanical injuries, weapons, regional injuries
- Asphyxia: hanging, strangulation, drowning