Hair Structure and Analysis Concepts

The video tutorial discusses the significance of hair evidence in crime scenes, explaining how hair can be analyzed to determine its origin, whether it is human or animal, and other characteristics. It covers the structure of hair, including the cuticle, cortex, and medulla, and how these components can be used to gather evidence. The video also explains the life cycle of hair, the differences between human and animal hair, and advanced analysis techniques like Neutron Activation Analysis (NAA) to detect chemicals and drugs. Additionally, it touches on the types of DNA found in hair and their implications for forensic analysis.

What can be determined from hair found at a crime scene?

• The person's height

• The person's favorite color

• Whether the hair is human or animal

• The exact age of the person

Which part of the hair is similar to the paint on a pencil?

• Medulla

• Cuticle

• Follicle

• Cortex

What does the medulla in hair resemble in a pencil?

• The paint

• The lead

• The wood

• The eraser

What is the role of melanin in the hair cortex?

• Protects the hair

• Determines hair length

• Gives hair its color

• Determines hair thickness

What type of evidence is hair without follicle cells considered?

• Circumstantial evidence

• Direct evidence

• Class evidence

• Individual evidence

During which phase does hair actively grow?

• Telogen

• Catagen

• Dormant

• Anagen

What happens to hair during the catagen phase?

• It falls out

• It grows rapidly

• Growth slows and stops

• It changes color

What is a key difference between human and animal hair?

• Animal hair lacks a cuticle

• Human hair has a thicker medulla

• Human hair has a thinner medulla

• Animal hair has a uniform color

What can Neutron Activation Analysis (NAA) determine from hair?

• The person's age

• The presence of specific elements

• The person's diet

• The hair's length

What is the significance of mitochondrial DNA in hair analysis?

• It identifies the individual's father

• It determines hair color

• It is unique to each person

• It is shared with maternal relatives