Forensic science test
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)
