Objective: Students will be able to describe the physiology of fingerprints. Do Now 1. What is your predicted grade for the test now that you took it? 2. T/F: a fingerprint is an individual trait for everyone except identical twins 3. What does this graph tell us about - PowerPoint PPT Presentation
Objective: Students will be able to describe the physiology of fingerprints.
Objective: Students will be able to describe the physiology of fingerprints.Do Now1. What is your predicted grade for the test now that you took it?2. T/F: a fingerprint is an individual trait for everyone except identical twins3. What does this graph tell us about fingerprint patterns?
AnnouncementQuiz 4 make ups this weekExtra credit: hand sanitizer, paper towels, tissue, napkins, Band-Aids and hand soap (especially for this unit)Notebook check on ThursdayNew exit ticket styleQuiz on TuesdayGloves on Friday and MondayExit Ticket Point of exit ticketGraded everyday4/5 per weekStill part of notebook gradeTrack your gradePurpose FingerprintsLook at your fingersThere are raised portions on your hands and toes whose function is to help with gripThese raised portions are called friction ridges
CFU: Raised portions used for gripping
PrintWhen these ridges press against things they leave something know as a fingerprintThe print left behind consist of natural secretions from the sweat glandsIncludes water, oil, and saltand dirt from everyday activity
CFU:T/F: A fingerprint is made when your ridges press against something. This is related to the Locard exchange principle.
DevelopmentStart to form between 10th-16th week of development Basal layer- layer in the skin where skin cells are produced
What Happens?In the fetus, the basal layer grows faster than the epidermis on the outside The layers collaps and folds in differentdirectionsCannot be altered or destroyed permanently because the outer layer protects it
Turn and Talk: When are ridges formed and how do ridges form? Loops, whorls, and archesFingerprint characteristics are named for their appearancecalled patternsArches 5%- enter one side of the fingerprint, rise in the middle, exit the other side of the fingerprintWhorls 30%- looks like a bulls eye (circles)Loops - 65% - enter from one side and exit on the same sideExerciseWhite BalloonMoist wipes
Ink your thumb from nail edge to nail edge way from the top, 2/3 way from the bottom Roll your thumb over the balloon from nail edge to nail edge Inflate the balloon half way, do not tieObserve your finger print. Is it loop, whorl, or arch?Observe a classmates BertillonageAlphonse BertillonDeveloped the first organized system of identifying individualsHe said that the odds of two people having the same bertillonage measurements were 286 million to oneDistinguished by Measurements of key featuresDIAMETER OF HEAD, WIDTH OF THE ARMS OUTSTRETCHED CFU:T/F: The bertillonage system identified people using the measurement of key featuresFingerprint Matching activityUsing the following sheet in front of you:From the impression match the ones that are made by the same fingerSome may have 3 matches some may have no matchesFor the ones that match, circle or highlight the figures of the print that appear the same example
Exit TicketRaised portions on your hands that allow for gripping:Fingerprint b. Whorls c. Friction Ridges
Define basal layer.
3. If 65% of fingerprints have loops, how are fingerprints considered individual evidence?