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WorksheetsUnit 2: Hair, Glass, and Fiber Review Outline
Total questions: 20
Worksheet time: 15mins
What are the primary functions of hair?
Regulates body temperature
Decreases friction
Protects against sunlight
Attracts mates
Absorbs nutrients for the body
The basic structure of the hair shaft includes...
Cuticle
Cortex
Medulla
Telogen
What are the different types of cuticles?
Cuticle- Crown-like
Spinous- Petal-like
Imbricate- Flattened
Medulla Patterns
Continuous -----------------
Interrupted - - - - - - - -
Fragmented/Segmented - - ---- ---- -
None
How can forensic scientists tell what part of the body a hair originated from?
Head- Similar to everyone with diameter and evenly distributed pigment
Pubic- Short, curly, and coarse
Facial- Coarse, triangular cross section, and wide medulla
Limbs- Short, arc shaped, tampered at the tips often
What are the length of the cycles of hair growth? 1. Anagen, 2. Catagen, 3. Telogen
6 weeks / 2-3 months / 2-3 weeks
6 years / 2-3 weeks / 2-6 months
2-3 weeks / 6 months / 6 years
What are the basic, broad categorizations of racial differences in hair? (African, European, Asian)
African- Flat cross section, can be curly, wavy, or coiled
European- Fine-medium coarseness and straight or wavy, Blond to brown to black, evenly distributed pigment
Asian- Coarse, straight, and circular cross section
What is the medulla index? How is the index different from humans and animals?
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The ratio between the medulla and the hair shaft. Human index- 0.33 or less, Animals- 0.5 or more
What can investigators learn from chemical tests on the hair shaft?
The race of a person, blood type, and any toxins / drugs in the blood
gender / race
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What is a hair follicle? Why is it important/what information does it give?
The tip of the hair. it does nothing
The small tag pulled from a hair. Shows the hair has been taken out by force.
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What information do forensic scientists collect from fibers? What do they look for?
They collect information on what fibers are left at a crime scene, what fiber is left on people/thing from a scene, and what the fiber(s) is/are
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How is fiber evidence collected?
Tweezers and maybe even vaccumes
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In what ways is fiber evidence tested? Destructive and Non Destructive
- microscope
observation
- burning
- thermal decomposition-
chemical tests, - density, refractive index, fluorescence
What are the different ways fibers are classified?
natural fibers- fibers that come from plants, animals, or minerals
synthetic fibers- man made fibers
What are the different types of weave patterns?
1-Plain, 2-Basket, 3-Satin, 4-Twill, 5-Leno
What kind of solid is glass?
amorphous
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What are some compounds that glass is made of? What is the most common type of glass? What is the most common type of glass?
silicon dioxide (SiO2)
sodium oxide (Na2O)
calcium oxide (CaO)
Most commom is CaO (aka soda-lime glass)
How is density of glass calculated? D=m/V
Find volume of glass with test tube, weigh glass, do density
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Atlanta Child Murders- Who was convicted? (and on how many charges?)
Wayne Williams. 2 charges for the murder of Nathaniel Carther and Jimmy Ray
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Atlanta Trial Mistakes
main evidence was trace evidence, meaning nothing truly pointed fingers at him being the murderer
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