1. Is hair class or individual evidence? Class 2. Does hair only absorb substances from inside the body? _No, Inside and out_ 3. From hair, one can determine the following: _Human or animal Race Origin of location on source s body _Hair forcibly removed or shed Chemicals or drugs? 4. 5. Three basic patterns of hair are: Which one is human? Imbricate Hair is composed of: Sulfur. 1
6. The Cuticle, which is the outside covering, made of overlapping scales. 7. The _Cortex, which is the inner layer made of keratin and embedded with pigment. 8. The _Medulla, which is the inside layer running down the center of the cortex. 9. 10. The Cuticle is the outermost layer of hair which is covered with scales. The scales point toward the tip of the hair. Scales differ among species of animals and are named based on their_appearance. 11. What gives hair its shape? _Cortex 12. 2 major characteristics of hair: Melanin-Pigment granules that give hair its color. Cortical Fusi- air spaces, usually found near the root but may be found in hair shaft. 13. Is the medulla of the hair core always visible? No 14. Types of Medulla patterns: a. _Intermittent or interrupted b. _Fragmented c. _Continious d. _Stacked e. _Absent 15. Human medulla may be _Continious, _Fragmented, or absent. 16. How can the medullary index be determined? By measuring the diameter of the medulla by the diameter of the hair. 17. Types of hair Round-Straight Oval-Curly Crescent Moon-Kinky 2
18. 3 stages of hair growth: _Anagen is the stage where the hair is actively growing: lasts up to _5 years. _Catagen is the stage where the hair is not growing; it is a _resting phase. _Telagen is the stage where the follicle is getting ready to push the hair out. (Lasts how long?)_2-6 months 19. How far does hair grow per day? _.4mm per day How far does hair grow per month? 1/2_in inches. 20. Human roots look different based on what? If they were forcibly removed or fell out. 21. Animal roots vary but in general have a spear shape. 22. Dyes hair has color in the Cuticle and Cortex. 23. Bleaching removes pigment and gives hair a yellow tint. 24. What is the difference in where nuclear DNA and mitochondrial DNA are found in hair? Nuclear found in root. Mitochondrial DNA in shaft only from mother. 25. Hairs in questioned must be accompanied by _adequate number of control samples. 50 full length hairs from all areas of scalp (how many) 24 full length pubic hairs (how many) 26. What are the advantages of using hair as evidence? _Easy to collect and store Externally available Can show drug use of poisoning 27. Discuss what was discovered by the hair of Napoleon Bonaparte? That he was poisoned with arsenic. 28. Which part of the hair contains the color of the hair? Cuticle and the Cortex. 29. How can it be determined if hair has been dyed? _If cuticle shows color 30. How can it be determined when hair was last dyed (approximately)? Measure the miscolored roots. 1cm per month 31. Determine the following origin of hair: mouse 32. Determine the following origin of hair: cat 3
34. Determine the following origin of hair: human 34. Determine the following origin of hair: 35. What are the tiny pockets from which hair grows called? _Hair follicle 36. How can hair be compared? _Color Color and intensity of granules Length _Diameter _Distribution _Shape 37. How was the following hair removed? _Forcibly removed Natural shedding 4
Ocular Body tube Revolving Nosepiece Medium power Objective Low power objective High power objective Stage Clips Diaphragm Arm Stage Course Adjustment Knob Fine Adjustment Knob Light source Base 38. When placing a slide on a microscope, which power objective lens is used first? Lowest 39. After placing a slide on a microscope, which focus is used first? _Course adjustment nob 40. How should a microscope be carried? One hand on arm, other on base. 41. The root contains _Nuclear DNA. 42. The hair shaft contains abundant Mitochondrial DNA, inherited only from the mother. 43. Why is DNA testing of hair not used more often? _Expensive, _Slow or difficult_ 44. Questioned hairs must be accompanied by an adequate number of control samples from _Victim, Suspects, and others who may have deposited hair at the scene. 5
45. What power of magnification is used with the low, medium, and high power objective lens? 4x, 10x, 40x 6