Forensics Unit 2 Review Sheet

Forensics – Unit 2 Review Sheet

Fingerprints 1. List the three types of fingerprints that could be found at a crime scene. a. ______b. ______c. ______

2. Are fingerprints considered class or individual evidence? Why or why not? ______

3. Ridge characteristics can be found on what three areas of the body? a. ______b. ______c. ______

4. What are the three main types of fingerprint patterns? a. ______b. ______c. ______

5. Which pattern is the most common one found in the population? ______

6. Which pattern is the least common one found in the population? ______

7. True or False: Fingerprints change over time on an individual? ______

8. The Primary Henry Classification identifies the presence of ______patterns on fingers and each finger is assigned a number based on the presence or absence of that pattern on that particular finger. 9. The Secondary Henry Classification is used to calculate the ______of a particular fingerprint pattern on a finger in the population.

10. What type of classification is used to match an unknown print to a known print?

______

11. What are minutiae? How are they used in fingerprint ID? ______

12. Why is hair important evidence (hint: think about its structure). ______

13. Is hair considered class or individual evidence? Why or why not? ______

14. How can hair and fibers have probative value? ______

15. Hair morphology (label the different parts of a hair):

i. Medulla ii. Cortex iii. Cuticle 16. Which part of the hair contains the pigment? ______17. What protein is hair mainly composed of? ______18. What are some structural ways in which human hair differs from the hair of other mammals? ______19. Draw the cross sectional shapes of hair: Round, Oval, and Crescent.

20. Why would it be risky to assign race to a suspect based on this characteristic. ______21. True or False: Medulla patterns vary among individuals and among hairs of an individual? ______22. Three growth phases of hair are anagen, catagen, and telogen. At which phase would hair be least likely to have a follicular tag (composed of skin and blood cells) if it was pulled out? Why would a follicular tag be important for a crime investigation? ______23. How can hair be a chemical indicator or how can one get a false positive from a hair sample? ______24. What are the two main types of fibers – give examples of each. a. ______b. ______25. Are fibers considered class or individual evidence? Why or why not? 26. Synthetic fibers are made of ______(long chains of repeating chemical units called monomers).

27. What are the two parts that make up the fabric? (smaller components) a. ______b. ______28. What is the warp and weft on a piece of fabric? a. Warp-______b. Weft-______

29. How is synthetic fiber made? ______30. What are some ways that you would go about identifying fibers? a. ______, b. ______, c. ______,d. ______