Forensics: chapter 3 review

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false

All hairs on the head of a person are identical

straight with evenly distributed granules

Although variations can occur, which of the following best describes northern European hair?

· hair consists of a FOLLICLE embedded in the skin that produces the shaft · the shaft is composed of the outer CUTICLE, a CORTEX, and an inner MEDULLA. · The MEDULLA is the central core. · The CORTEX is the area outside the medulla and contains pigment granules. · The CUTICLE is the tough outer coating with layers of scales. · Each of these varies among individuals and species.

Describe the structure of hair. Include in your answer the terms follicle - medulla - cortex - cuticle

false

Hair is composed of a protein called cellulose

imbricate

Human hair has which type of cuticle?

silver

Neutron activation analysis can check hair for the presence of.....

true

The cortex may contain pigment granules

tip of the hair

The cuticle scales of the hair always point toward the.......

medulla

The hair shaft is composed of the cuticle, cortex and.......

anagen stage

The period of active hair growth is called

width of medulla and width of hair

Which factors are used to calculate the medullary index of the hair?

dark medulla

Which of the following characteristics is found in typical Asian hair?

a yellowish tint to the hair

Which of the following is most likely a result of hair bleaching?

root or the follicle

Which part(s) of a hair can be analyzed for DNA?

· Class evidence is a material that connects an individual or thing to a certain group · Hair cannot be used to identify a specific individual because only a group of people share a similar type of hair.

Why is hair considered class evidence?

comparison microscope

a compound microscope that allows the side-by-side comparison of samples, such as of hair or fibers

individual evidence

a kind of evidence that identifies a particular person or thing

neutron activation analysis

a method of analysis that determines composition of elements in a sample

cortex

area outside the medulla and contains pigment granules.

melanin granules

bits of pigment found in the cortex of a hair

human hair has a smaller medulla human hair index is .33, animal hair index is .50 or greater anima hair has a denser pattern of pigmentation humans have an imbricate cuticle

describe the difference between human and animal hair

follicle

hair consists of a ______embedded in the skin that produces the shaft

the ratio of the diameter of the medulla to the diameter of the entire hair

how do you calculate the medullary index for a hair?

the hair follicle is present

how do you know if a hair was forcibly removed from a victim?

class evidence

material that connects an individual or thing to a certain group

trace evidence

small but measurable amounts of physical or biological material found at a crime scene

cortex

the region of a hair located outside of the medulla containing granules of pigment

cuticle, cortex, and an inner medulla

the shaft is composed of what 3 things?

cuticle

the tough outer covering of a hair composed of overlapping scales

true

true/false: The shaft of the hair is considered class evidence in a trial

cortex

what is the largest part of the hair shaft?

medulla indez

what is the ratio of the diameter of the medulla over the diameter of the whole hair

imbricate

what type of cuticle does human hair have?

· Human hair has a smaller medulla; humans less than .33 index, animals have .50 or greater index. · Animal hair has a DENSER PATTERN OF PIGMENTATION · Humans have an IMBRICATE Cuticle type

Crime-scene investigators collected hair from a dead person's body. One of the first things that needs to be established is if this hair is human or animal. Describe two ways that animal hair differs from human hair.

keratin

a type of fibrous protein that makes up the majority of the cortex of a hair

scales point to the tip

which direction do the scales point?

hair follicle

the actively growing root or base of a hair containing DNA and living cells

medulla

the central core of a hair fiber


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