minicase4 fingerprinting

8/3/2019 MiniCase4 Fingerprinting

http://slidepdf.com/reader/full/minicase4-fingerprinting 1/8

1 KIS International School Science 2010

1. The Power of Words

Obtain (v)to get (something)

Omar obtained the information that he needed from the tourist

information booth.

Step 1. Copy the above word into your Vocabulary Book.

Step 2. Complete the activity on the back of this page.

CSI: THE FINGERPRINT ANALYSIS

Today’sTasks1. Power ofWords

2. Pre-Lab

3. Lab

4. Post LabQuestions

ATL

Connections

- Communication

- Information

Literacy

- Collaboration

A T L ’ s

C o m m u n i c a t

i o n

G r a d e 7 S c i e n c e

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Obtain Write a complete sentence about the cartoon above using the word Obtain .

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Write your own sentence using the word Obtain, suspect , and motive .

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The Power of

WordsAnswer the following in completesentences.

A T L ’ s

C o m m u n

i c a t i o n



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2. Pre-Lab TasksI need to know. . .

BackgroundSkin has two layers. The deeper layer is the dermis which contains sweat glands, oil glands,nerves and blood vessels. The outer layer is the epidermis which is made of several layers ofcells arranged along ridge patterns. Fingerprints are formed during the fourth and fifth month ofpregnancy and remain unchanged for life.

When skin touches a surface sweat and oils are transferred onto it often leaving behind animpression of the ridge pattern. These impressions are called latent fingerprints because theyare not usually visible to the eye.

Thumbprints were used centuries ago to authenticate documents, but fingerprints were firstdescribed in detail in the 1600s and werenʼt used in solving crimes until about 1880. Policenow use sophisticated software to compare fingerprints found at crime scenes to vastdatabases of stored fingerprint records.

On many surfaces, simple powders can be used to find fingerprints which can then be 'lifted'

using sticky tape to preserve them. Not all surfaces are smooth and shiny however, and manymaterials absorb perspiration and oils into them so sophisticated techniques to reveal andrecord fingerprints are often required.

Once the fingerprints are taken and labeled, forensic scientists use a classification system toidentify them. The three basic fingerprints pattern groups are Loop, Whorl, and Arch. Thereare more complex classification systems that divide the groups further (such as plain archesvs. tented arches, or double loops vs. single loops). We will only identify the three majorgroups.

A T L’ s

I n f o r m a t i o n L i t e r a c y



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Pre-Lab TasksI need to know. . .

A T L’ s

I n f o r m a t i o n L i t e r a c y



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1) What are two materials forensic scientists might use to obtain a fingerprint?

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2) What are the three major groups of fingerprint patterns?

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3) What do we call fingerprints on a surface that cannot usually be seen?

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4) Marc has been kidnapped, and is being held hostage. The kidnappers are demanding aransom of 20 million baht. To show they are serious they have sent a finger with the ransomnote!!! Marc only had his fingerprints taken when he was a baby. Can the police use thosefingerprints to verify if the finger is really Marc's? Explain why or why not.

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A T L’s

C o l l a b o r a t i o n 3. The LAB

MaterialsTape

Pencil

Fingers!

Procedure1) Rub a small dark area with a pencil

on a sheet of white paper.

2) Press and rub your right index

finger in the pencil-lead dust. 3) Place the sticky side of a piece of

transparent tape on the dusted finger.

4) Take the tape with the fingerprint

and tape it to the Fingerprint Table.

5) Continue the process until youhave all ten fingers finished.



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Left Hand

Fingerprints

Finger Left Little

FingerLeft Ring

FingerLeft Middle

FingerLeft Index

FingerLeft

Thumb

Type of

Print

Name: __________________

Right Hand

Fingerprints

Finger Right Little

Finger

Right Ring

Finger

Right Middle

Finger

Right Index

Finger

Right

Thumb

Type of

Print




Class Results

1) Find the frequency of fingerprint types on students' left ring fingers for thewhole class.

2) Complete the following table using your Math skills and a calculator.

3) Create a Pie Chart using your protractor.



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Fingerprint

Type of Left

Ring Finger

FrequencyRelative

Frequency

Angle for

Pie ChartPercentage

loop

whorl

arch

Total

Class Results

Pie Chart

Key

Loop - Green

Whorl - Red

Arch - Blue

A T L ’ s

I n f o r m a t i o n

L i t e r a c y

4. Post Lab Questions






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Discussion

1) What type of fingerprint was most common for your table?

2) What type of fingerprint was the most common for your class?

3) Were all of your fingerprints the same type?

4) Look at two of your fingerprints that are the same type. Are they identical?Would more fingerprints at the crime scene be helpful or not?

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5) Describe a crime in which fingerprint analysis would be useful. Write yourdescription in complete sentences.

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6) Describe three ways that a criminal might avoid having their fingerprintsfound at the scene of a crime.

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Conclusion

Write a 75 word conclusion summarizing what you did in class today. Whichfingerprints were the most common, how you think your results might change if

you took samples from the entire school, and why large data samples are

important.

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