Forensics

DNA

FORENSICS - SCIENCE IMPORTANCE - REGIONAL LAW ENFORCEMENT

What is Forensic Science?

Basically, forensics is scientific tests and techniques used in connection with the time of the crime. Similarily to any crime, forensics ties closely to DNA identification, which determines every personals individuality. DNA is a left behind evidence, whether its fingerprints, hair, blood, or fibers, there's always traces left behind!

DNA and Chromosomes Comparisons

Its quite simple, Chromosomes themselves are coiled up DNA, which its made up of. While DNA themselves is what makes chromosomes! Theyre both DNA!

What really is Meiosis?

Ofcourse its the traits passed from parents to offspring, but how does it really work? First off, its the formation of gametes (eggs and sperm cells) after sexual reproduction from organisms. The body cells are diploid, in other words, having two sets of chromosomes. The eggs and sperm unite into one during fertilization and they become haploid with a single set of chromosomes. During DNA replication, they go through 2 rounds, resulting in 4 haploid sex cells. Also, theyre not the same!

Evidence Gathering..

Physical Evidence is anything left behind to connect the offender to a crime seen, but what about biological evidence? It does tie with physical evidence, but its more that the naked eye cannot see, many things can be gathered for physical evidence such as:

  • Vomit
  • Blood
  • Hair
  • and etc.

All these things get taken to the lab for indentification, DNA is very unique to each person so it helps alot better to identify who was at the scene and what possibly happened. Leading to DNA Identification techniques!

DNA Identification Techniques!

This ties closely to Evidence gathering, now is the next step leading to lab processing! Since only a few cells can be sufficient enough to obtain useful information to help the case, means there's specific items of evidence that you may need to collect, the possible location of the DNA on the evidence, and the biological source containing the cells. Just because you cannot see a stain does not mean there are not enough cells for DNA typing. Source of DNA:

  • Sweat, Blood, Tissue, Skin, Dandruff, Hair, etc.

Evidence Itself:

  • Weapons, masks/hats, toothpicks, used cigarettes, glasses, blanket/pillow/sheet, fingernail, bitemark, bullets and etc.

Common locations of finding these DNA:

  • Surface Area, Tips, Handles, Scrapings, Skin and etc!

The technique is to find whatever you cant, whether you can see evidence or not. DNA is a powerful clue, just take your time and loko thoroughly in the crime scene.

By, ANYA STOKES B2 Biology