Fingerprints are an impression of the lines on the inner surface of the thumb and fingers Patterns are made by tiny ridges on the skin The ridges on our fingertips help us grip objects When we touch ID: 701167
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Slide1
Fingerprint LabSlide2
Fingerprints
Fingerprints are an impression of the lines on the inner surface of the thumb and fingers.Patterns are made by tiny ridges on the skin.
The ridges on our fingertips help us grip objects.When we touch an object, the oil and perspiration (sweat) on our skin leaves behind a latent (potential) fingerprint. Slide3
Fingerprints
Investigators dust latent fingerprints with a fine powder to make the patterns visible and then lift the fingerprints with sticky paper.Fingerprints are permanent details that are created before you are born.
No two fingerprints are the same, not even on the same person or on identical twins.Slide4
Lab Write Up
Title: Fingerprint Lab
Problem: Which is the most common type of fingerprint in our class?Slide5
`
3 Types of Fingerprints
Whorls30-35 % of people
Arches
5 % of people
Loops
60-65% of
peopleSlide6
Research
What do you know about fingerprints?
Have you ever checked your fingerprints? Tell me your experience with fingerprints.Slide7
Hypothesis
Hypothesis:
If… then…because…
If
each person finds their fingerprint type,
then
the _________ (loop whorl, arch) fingerprint will be the most common
b
ecause
__________
UNDERLINE
the words IF THEN
and BECAUSE in your hypothesisSlide8
Materials
1 piece of scratch paper1 pencil
1 magnifying glass1 roll of clear tapeSlide9
Variables
Independent Variable
(the one thing you change) – the type of fingerprint
Dependent Variable
(the one thing you measure) – the number of fingerprints Slide10
Procedure
Rub the pencil on the scratch paper until there is a smudge of graphite the size of your fingertip.Select which hand you will take fingerprints from.Beginning with your thumb. Rub it on the smudge until your thumb is covered in graphite.
Place a small piece of tape over your thumbprint and press down gently.Carefully remove the tape and stick it in the appropriate square on your data table.
Repeat the process for the other 4 fingers of your hand.
Look at your fingerprints and identify which type of fingerprint you have.
Record the class tallies for each type of fingerprint and then find the totalSlide11
Data
Loop
TABLE DATASlide12
`
Identify your type of fingerprintSlide13
GraphSlide14
After you make your graphAnswer the following questions using COMPLETE SENTENCES.
What percent of your class had arches? Whorls? Loops? Find the percentage by dividing the number of each type of fingerprint by the total number of fingerprints and then multiplying by 100
Ex: 5 whorls/20 total fingerprints = .25
.25 x100 = 25%
What is the most common type of fingerprint in
your class?
Was your hypothesis supported? Why or why not?
Make a Fingerprint AnimalSlide15
When you are finshed
Try
making some fingerprint animalsSlide16
Data
Tally Marks and then write the total
Loop
/Group Data