Name: ______________________________________________

Unit 2: Hair/Fibers/Fingerprints—Study Guide

Fingerprints

What fingerprint pattern has at least one ridge entering one side and exiting the same side? ______________

What fingerprint pattern has all ridges come in one side and exit the other? __________________

What fingerprint pattern includes at least one full circle? ___________________

What is the most common type of fingerprint pattern? _____________________

How many matching ridge characteristics are needed for courts to accept a match? ____________________

Match the type of latent print development with its description

____Works best on paper A. Powders

____ Works best on glass B. Silver Nitrate

____Works best on metal C. Ninhydrin

____Works best on fabric D. Cyanoacrylate (Superglue)

What type of developing chemicals react with the amino acids in our fingerprints?

What type of developing chemicals react with the fats in our fingerprints?

What type of developing chemicals react with the water in our fingerprints?

What is another name for ridge characteristics? __________________________

What parts of the body can create ridge characteristics?

Fill in the below types of ridge characteristics

__________________ ________________

__________________

__________________

__________________

__________________

________________

________________

______________

________________

__________________ __________________

Label the three types of fingerprint patterns:

Hair

What characteristics can be determined by examining hair under a microscope?

Label the three layers of the hair shaft:

Identify three differences between human hair and animal hair, and describe those differences for each in the table provided.

Difference Human Hair Animal Hair

Where can you find nuclear DNA in hair? _________________________________

Where can you find mitochondrial in hair? _________________________________

If a forensic pathologist wants to determine if a victim has been on drugs for the past year, how far out from the hair root should they start analyzing?

____________________ ____________________ ____________________

__________________________

__________________________

__________________________

A forensic technician is attempting to identify whether a hair sample is human or not. They measure the medullary index at ¼. Is this a human sample?

Explain each phase of hair growth:

Anagen: Catagen: Telogen:

Match the picture with its correct hair structure:

Medullas:

A. Fragmented B. Absent C. Continuous D. Interrupted E. Stacked

Cuticle Patterns:

F. Coronal G. Imbricate H. Spinous

______ ______ ______

______ ______ ______

______ ______

What feature is the best to use to determine whether a hair is human or not? __________________________

Based on this hair root, was the hair ripped out or did it fall out?

__________________ __________________

Fiber

List all natural fibers discussed in class: List all synthetic fibers discussed in class:

List the three sources of natural fibers and give an example of each:

Source: _____________________________ Example: _____________________________

Source: _____________________________ Example: _____________________________

Source: _____________________________ Example: _____________________________

What are the sources of most synthetic fibers?

What happens to synthetic fibers during a flame test?

What happens to natural fibers during a flame test?

Which type of fiber looks “perfect” under a microscope? __________________________

Label the below as being natural or synthetic:

___________________ _________________ _________________ _________________