Forensic science test

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What does hair consist of?

A follicle embedded in the skin that produces the shaft

What are the three stages of development for hair?

Anagen(growth), catagen(resting), and telogen(dormancy)

What can light microscopy and electron microscopy do?

Analyze hair chemically for drugs and toxins, also perform DNA analyses.

What/who is hair shared by?

By all mammals and functions and temperature regulation, reducing friction, protection from white, and as a sense organ

Gas chromatography

Can identify and quantify drugs, toxins, heavy metals, and even asses nutritional deficiencies

Hair follicle

Club shaped structure in the skin

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

Dark medulla

Hair can be used to determine?

Diet, drug habits, geographic history

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

Follicle, shaft, medulla

Nuclear DNA

Genetic material in nucleus

What can provide evidence for nuclear DNA?

Hair follicle

What can provide evidence for mitochondrial DNA?

Hair shaft

Keratin

Hair shaft is composed of this, it's produced in the skin. Makes hair both long and flexible

Animal hair can be distinguished from human hair because animal hair?

Has a greater medullary index and more variation in the cuticle patterns

Human hair has which type of cuticle?

Imbricate

Microscopic hair analysis?

Is used to exclude a suspect

Cortex

Largest part of the hair shaft

How does hair vary?

Length, medulla type, and cross-sectional shape, depending on where the body it originates

What forensic experts use to examine hair?

Light microscopy (phase contrast p, fluorescence,comparison) and electron microscopy

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

Oxidized hair and damaged DNA

Mitochondrial DNA

Present in hair shafts, can reveal some of a suspects or or victims family relationship

What is the shaft composed of?

Protein keratin and consists of the outer cuticle, a cortex, and an inner medulla, most of which can vary within and among individuals and among species. The shift also has pigments in mitochondrial DNA

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

Scale diameter of cuticle and length of the hair

What can the hair follicul provide for nuclear DNA?

Sequencing that may result in individual evidence

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

Straight or wavy with evenly distributed granules

The period when hair is naturally shed is called the?

Telogen stage

Cuticle

Transparent out layer of the hair shaft

What is useful to forensic experts?

Various hair treatments produce characteristic effects, and some hair characteristics allow them to be grouped into ancestral categories

Comparison miscroscope

used to analyze side-by-side specimens.

Melanin granules

Gives hair its color

What is hair?

It is a form of evidence that has been used in forensic science Analysis since the late 19th century

Medulla

the inner region of an organ or tissue, especially when it is distinguishable from the outer region or cortex (as in a kidney, an adrenal gland, or hair)


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