Hair Analysis
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Why can hair be considered both class and individual evidence?
Individual evidence can be derived if the follicle were intact and nuclear DNA could be retrieved from it. hair can yield class evidence (related to hair Ancestry).
What is gas chromatography?
A method of separating chemicals to establish their quantities
What can be revealed about an individual if chemical tests are performed on hair?
It can reveal drugs, toxins, heavy metals and nutritional definiens.
What is nuclear DNA?
Genetic material in nucleus DNA.
What is mitochondrial DNA?
Genetic material in the mitochondria of the cytoplasm; only inherited from the mother
What are the several functions of hair?
regulates body temperature, decrease friction, protects against sunlight, acts as a sense organ
What are the two basic structures of human hair?
A follicle and a shaft
Where is the hair shaft?
The visable part of the hair that sticks out of the skin.
Where is the hair follicle?
is underneath the skin
What is hair composed of?
keratin
What are the three main components of the hair shaft?
Cortex, Cuticle, Medulla
what is the cortex?
The region of the hair located outside the medulla that contains granules of pigments
What is the cuticle?
the tough outer covering of a hair that is composed of overlapping scales.
What is the Medulla?
the central core of a hair.
What are melanin granules?
Particles of pigment found in the cortex of the hair
What are the five types of medulla?
Continuous, Interrupted, fragmented, Solid, None
What is continuous Medulla?
one unbroken line of color
What is fragmented Medulla?
Pigment line is unevenly spaced
What is interrupted Medulla?
Pigment line broken at regular intervals
what is solid Medulla?
Pigmented areas filling both the medulla and cortex
what is none Medulla?
No separation pigmentation in the medulla
Why do crime scene investigators try to collect at least 50 hairs from a crime scene?
To compensate for inconsistencies
What are the six types of hair found on the human body?
Head hair, Eyebrow and eyelash, Beard and Mustache Hair, Underarm Hair, Body Hair, and Pubic Hair.
What are the three stages of the hair life cycle?
Anagen, Catagen, Telogen