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Forensics Unit 2
| Question | Answer |
|---|---|
| Keratin | Fibrous Protein that makes the cortex of the hair |
| Cuticle | Outside of the Hair |
| Cortex | Middle of the Hair |
| Medulla | Inside of the Hair |
| When is hair individual evidence | Only when the follicle is still currently attached |
| Secondary Transfer | Hair that has been left behind or caught on things |
| Purpose of hair on mammals | Regulate body temperature, decrease friction, protect form sunlight, sense organ |
| What can you attain from running a chemical test on hair? | Drug use, Toxins, Heavy Metals and Nutritional Deficiencies |
| What is Different with Animal hair and Human hair? | Animal hair has a bigger mudulla, human hair has greater pigmentation concentrated near the cuticle, Human hair is always imbricate, animals are not |
| How fast does hair grow | 1.3cm every month |
| Six Types of hair on the human body | Head, Eyebrows and Eyelashes, Beard and Mustache, Underarm, Body, Pubic |
| Which type of hair on the body can have a double medulla | Beard hair |
| How much hair is usually collected for investigations | 25-50 hairs |
| Where is hair for an investigation collected from? | The Head |
| Why do they need soo much hair for investigations | Human head hair shafts have variations, also so they can run multiple tests |
| Which 3 tests can you perform on hair | Nuclear DNA Mitochondrial DNA Drug test via chemical analysis |
| What happens in a nuclear DNA test on hair | They format it into a PCR test and break it down from there |
| What happens during a Mitochondrial DNA test | Determines genetic relationships through the Mother |
| Examples of Polymer Fiber | Polyester, Nylon, Acrylic, Olefins |
| What is Polyester | Polar Fleece that is wrinkle resistant |
| What is Nylon | Artificial Silk |
| What is Acrylic | Artificial Wool |
| What are Olefins | Fiberfill insulation ex;Thermal Socks, Quick Drying, |
| Why is it Important to collect fibers early on | Within 24 hours, 95% of fibers have been lost from the crime scene |
| What is Yarn | Short Fiber spun together |
| What is Cellulose | A plant material that is used when making things that can stretch and bend |
| How does Direct transfer relate to hair | Fibers transferred directly to the subject |
| How does Secondary transfer relate to hair | When the victim picked up fiber then transfered them to the suspect |
| 5 Fiber Characteristics important to forensic scientists | Type of Fiber Fiber Color Number of Fiber Where the Fiber was found textile from the fiber's origin Multiple fiber transfer |
| 3 ways Fiber evidence can be collected | Tape Vacuum Forceps |
| Sources of natural Fibers | Animals, Seed fibers, fruit fiber, leaf fibers, mineral fibers |
| Which Fibers are Natural | Cotton, Silk, Linen |
| Which Fibers are Synthetic | Nylon, Rayon |
Created by:
Matthew Stephens
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