16.2 Describe three major type s of tool mark im 16.3 Describe pressions. Use a clean 10 ml pipette for each of the six DNA samples. Another important feature of tools used in identification are serial numbers. Martin Coneely forged Lincoln’s wills. What characteristics of the hammer impression were used to match a specific hammer to the crime-scene impression? “Probe” your gel with the radioactive GTA fragments. Fibers are an excellent source of trace evidence because Obj. (Be prepared for dust to settle on everything in the classroom.) Lauscaux Chamber: The Lascaux chamber developed and described by Olivier Masson, which is available commercially from Lascaux Restauro, incorporates ultrasonic humidification. improved fingerprint collection in 1891. 8. Obj. For example: Maggots can help detect if a dead person had poison or drugs in the body at the time of death. Patricia developed curricula and taught high school forensic science and biology at Scotia-Glenville High School for several years. 9. Press the tape, sticky side down, into the box provided on the next page. Case 4 Often, several different labs need to share a very small amount of evidence. Calculate the angle of impact for individual drops of blood spatter. Your task is to produce cast impressions for comparison to the tool mark evidence found at the crime scene. In both cases, homicide would be the manner of death. Obj. 136 Fingerprints The individual nature of fingerprints has been known for about 2,000 years, but scientists only recently understood how fingerprints form in the womb. Crime-scene investigators collected hair from a dead person’s body. Flax is the most common stem fiber and is most commonly found in the textile linen. Obj. They may be less effective for determining direct links between individuals and places. 12. 3. c. How can pollen link someone or someplace to a crime scene? Obj. Notice the white strands of DNA forming at the interface between the bottom of the alcohol and the top of the wheat germ mixture. ❑ I properly handled and packaged all materials considered evidence into a bindle. However, the alleles for blue eye color occur more frequently among northern European DNA Fingerprinting 163 CHAPTER populations. 3. Because they were from different production locations, investigators believed the tampering occurred after the product was shipped, rather than in the factory. The TBE buffer should be at least 2 millimeters above the surface of the gel. b. S U MM A RY • Forensic palynology can provide information about the geographic origin of a crime and the time or season when it took place. Repeat steps 11 to 12 for each of the other sample locations and record the results on Table 1. The tail points in the direction of blood’s movement. (JFM) Despite their relative thinness and flexibility natural membranes can sometimes be too strong when applied to very degraded parchments. Explain why using the Canons of Proportions on teenagers to estimate height would provide less accurate data than using the canons of proportions on adults. DNA Fingerprinting 189 Profile set #1 Ladder Mother Child Alleged father #1 Profile set #2 Ladder Mother Child Alleged father #2 Questions: 1. 4. Gently rotate the test tube for at least three minutes holding the test tube at eye level. Lab Procedure for DNA Fingerprinting These steps are followed when performing DNA fingerprinting on crimescene evidence. They are formed between two layers of skin, and their shape does not change during a person’s lifetime. This measurement can be taken from center to center. As expected, the dust was identified as marijuana pollen. Record your answer in Data Table 2 as described in Step 8. World of Forensic Science, Volume 1. Record on Table 1. Due to electronic rights restrictions, some third party content may be suppressed. Include in your answer: Which insect is usually the first to arrive on the dead body? Materials: (per group of two to four students) Part A: 1 cardboard box 1 large plastic garbage bag (at least kitchen-sized) 1 empty plastic, 39 oz. Be sure to find the entire sequence: AAGCTT. 2. Scenario: A dead body has been found. 14.3 a) copper b) silver c) lead d) aluminum 12 13 14 10. It is unpleasant to use and has no advantage over ethanol/water solutions (. Type of Weave Diagram Description Characteristics Alternating warp and weft threads • • • • 1 2 Plain firm and wears well snag resistant low tear strength tends to wrinkle 3 4 5 6 Basket Alternating pattern of two weft threads crossing two warp threads 7 • • • • an open or porous weave does not wrinkle not very durable tends to distort as yarns shift • shrinks when washed 8 9 Satin One weft crosses over three or more warp threads. The date was June 13, 1994, and the two bodies were those of Nicole Brown Simpson and Ronald Goldman. The overall appearance of the female’s skeleton tends to be much smoother (gracile) and less knobby than that of a male’s skeleton (robust). Within minutes of a death, certain insects are attracted by the smell of the first stages of decomposition. Pollen from aquatic angiosperms, such as sea grasses, is dispersed by water. The bullet follows the lands and grooves pattern of the barrel and begins its spiral before it leaves the barrel. Its many uses include pipe coverings, brake linings, ceiling tiles, floor tiles, fire-resistant work clothes, shingles, home siding, and insulation for building materials. On a legal technicality, his sen- 13 14 15 16 17 444 Casts and Impressions tence was changed to life imprisonment. TYPES OF CORTEX 11 12 The hair shaft is made up of three layers: an inner medulla, a cortex, and an outer cuticle. This greater length makes it more difficult to separate the VNTR sequences. These details provided identification evidence for the state to put Elmer McCurdy to rest, once again. He was unable to describe either of his attackers, but he did manage to scratch the face of one of the assailants. Safety Precautions: None Time Required to Complete Activity: 40 minutes Materials: textbook Figure 13-20 pencil or pen calculator (optional) Procedure: 1. Your presentation should include items listed above. Use a sterile pipette each time you transfer the urine from the student urine samples to the vials to avoid contamination. among different 13.6 Describe the role of mito chondrial DNA in bone identificatio n. Vocabula ry anthropolo gy the sc ientific of the o study rigins a nd behav well as ior as the phys ical, so and cult cial, ural dev elopment humans. The forum is the historical equi- witness in court. Obj. One chromosome in each pair is inherited from the mother; the other chromosome of the pair is inherited from the father. Original evidence bag 28 ©Cengage Learning ©Cengage Learning ©Cengage Learning 17 b. Belmont, CA: Thomson Higher Learning, 2008.
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