Name ___________________________________________ Date _______________ Bite mark analysis

1. Name ___________________________________________ Date _______________ Bite mark analysis Go to http://www.leikerforensics.wikispaces.com. Click on “Class activity links” on the left. Click on “Bite mark analysis” 1. Read through the first few paragraphs and describe three reasons why bite marks are a difficult piece of evidence to use. 1. _____________________________________________________________________________________ ___________________________________________________________________________________ 2. _________________________________________________________________________________ ___________________________________________________________________________________ 3. _________________________________________________________________________________ ____________________________________________________________________________________. There are four steps the forensic dentist does when a bite mark is part of crime scene evidence. Name these. 1. _________________________________________________________________________________ 2. _________________________________________________________________________________ 3. _________________________________________________________________________________ 4.__________________________________________________________________________________ What does this mean? “The victim was found with an abrasion on the left leg, a hemorrhaging bite, and an avulsion. ____________________________________________________________________ _________________________________________________________________________________ Click on “Bite mark cases” 2. Scroll down and read the case about Ray Krone. What was Ray accused of? ___________________________________________________________ What specific evidence was used to convict him of his crime? _______________________________ _________________________________________________________________________________ What evidence helped overturn the case? _______________________________________________ What does this case prove about bite mark evidence? _____________________________________ _________________________________________________________________________________

2. Click on odontology activities. Click on DNA Extraction Activity on the left. When will the odontologist turn to DNA to identify a victim? _______________________________________________________________________________________________________________________ When looking at each step, be sure to use the arrow over button to see all the information. STEP ONE: Find DNA What part of the tooth is generally used to get DNA from? ________________________________________ STEP TWO: Extract DNA What are the three steps in getting the DNA out of the tooth? 1. ________________________________________________________________________________ 2. ________________________________________________________________________________ 3. ________________________________________________________________________________ STEP THREE: Multiply DNA What is polymerase chain reaction? __________________________________________________________ ________________________________________________________________________________________ STEP FOUR: Results When DNA is pushed through the gel to create the DNA profile, how are the DNA pieces positioned? _____________________________________________________________________________________________ STEP FIVE: Identify How do you know when a DNA profile is a match? ______________________________________________________________________________________________________________________________________