Forensics Chapter 3 Review

The shaft of the hair is considered class evidence in a trial.

Hair is composed of a protein called cellulose.

All hairs on the head of a person are identical.

The cortex may contain pigment granules.

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

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

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

Human hair has which type(s) of cuticle?

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

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

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

The period of active hair growth is called the ___ stage.

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

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

Hair Evidence in Forensics

The hair shaft serves as class evidence in legal trials, aiding in establishing connections between suspects and crime scenes.
Hair is composed of keratin, not cellulose, which is a common misconception.

Hair Structure and Composition

Hairs on a single individual's head are not all identical; they exhibit variations.
The hair shaft contains three main layers: cuticle, cortex, and medulla.
The cortex layer may include pigment granules, influencing hair color.

Medullary Index

The medullary index is determined by the relationship between the width of the medulla and the width of the hair shaft.

Hair Characteristics by Ethnicity

Asian hair commonly has a flattened cross-section.
Human hair may have pigmented cuticles, which can be analyzed to determine individual characteristics.

Hair Analysis Techniques

Neutron activation analysis can detect elements like silver in hair.
DNA analysis can be performed on the hair root, which contains genetic material.

Cuticle Structure

Cuticle scales directed toward the hair tip are significant when analyzing the hair's structure.

Hair Growth Phases

The anagen stage denotes the period of active hair growth, which can influence forensic investigations.

Characteristics of Specific Hair Types

Northern European hair typically appears straight with uniformly distributed granules.
Hair bleaching often results in a yellowish tint, which can signify chemical treatment.

Test your knowledge of forensics with this Chapter 3 review flashcard quiz. Covering key concepts about hair analysis, this quiz will help solidify your understanding of class evidence and hair composition. Perfect for students studying forensic science.