They recovered blood stains from several locations in

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examined it for evidence. They recovered blood stains from several locations in the vehicle, including two stains on the carpet on the floor of the driver’s side, one on the center console of the dash of the vehicle, and one on the steering wheel. Here are the CODIS marker results on these samples from Tang’s SUV:   Genotype CODIS  Marker Carpet  Stain 1 Carpet  Stain 2 Center Console Steering Wheel CSF1PO 11, 13 10, 11 10, 11, 12 10, 11, 13 FGA 22, 27 23, 28 20, 22, 23, 25, 27, 28 22, 23, 27, 28 THO1 6, 6 7, 9.3 6, 7, 9, 9.3, 10 6, 7, 9.3 TPOX 10, 12 11, 11 8, 10, 11, 12 10, 11, 12 VWA 17, 18 13, 18 13, 15, 17, 18, 20 13, 17, 18 D3S1358 17, 20 15, 16 15, 16, 17, 20 15, 16, 17, 20 D5S818 13, 15 11, 14 7, 11, 12, 13, 14, 15 11, 13, 14, 15 D7S820 10, 11 8, 8 8, 10, 11 8, 10, 11 D8S1179 13, 13 9, 17 9, 11, 13, 14, 17 9, 13, 17 D13S317 9, 10 11, 14 8, 9, 10, 11, 12, 14 9, 10, 11, 14 D16S539 9, 14 11, 12 9, 11, 12, 13, 14 9, 14, 11, 12 D18S81 16, 20 12, 15 12, 15, 16, 20 12, 15, 16, 20 D21S11 31.2, 32 26, 31 26, 29, 30, 31, 31.2, 32 26, 31, 31.2, 32 1a. First, you have been asked by the television station to verify the forensic testimony regarding the probability of finding the exact combination of CODIS genotypes in the population as was found in the suspect, Tang. Using the methods you learned in class/section, please calculate this probability for the proper reference population for this individual. SHOW YOUR MATH (attach an extra page if necessary)! (13 points). CSF1PO 10, 11: 2*0.25681*0.24903= 0.1279067886 FGA 23, 28: 2*0.17054*0.01163= 0.0039667604 THO1 7, 9.3: 2*0.42054*0.10465= 0.088019022 TPOX 11, 11: 0.21899*0.21899= 0.0479566201 VWA 13, 18: 2*0.00775*0.15504= 0.00240312 D3S1358 15, 16: 2*0.30233*0.33527= 0.2027243582 D5S818 11, 14: 2*0.23256*0.01550= 0.00720936 D7S820 8, 8: 0.23643*0.23643= 0.0558991449 D8S1179 9, 17: 2*0.00581*0.00388= 0.0000450856 D13S317 11, 14: 2*0.30620*0.03488= 0.021360512 D16S539 11, 12: 2*0.31783*0.19574= 0.1244240884 4
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A211 Name:___Jane Hall_________________ D18S81 12, 15: 2*0.07782*0.16148= 0.0251327472 D21S11 26, 31 2*0.00194*0.08140= 0.000315832 0.1279067886*0.0039667604*0.088019022*0.0479566201*0.00240312*0.2027243582*0.0072 0936*0.0558991449*0.0000450856*0.021360512*0.1244240884*0.0251327472*0.000315832 =0.00000000000000000000000039993 probability or 1 in 2,500,437,576,575,900,000,000,000 5
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A211 Name:___Jane Hall_________________ 1b. At trial, the prosecution has argued that some of this blood evidence can be attributed to one of the victims, some to Tang, and some is a mixture from multiple sources. For each sample, identify the source(s) of the DNA based on the CODIS genotyping results (7 points): Collected From Sample Source(s) Crime Scene Blood on Silverman Shoe  Janice Black Flanders   Blood on Concrete Tang Flanders   Blood on Gate Tang Flanders   Blood under Fingernails Janice Black Flanders Tang Property Glove blood sample 1 Mack Silverman   Glove blood sample 2  Janice Black Flanders, Mack Silverman, Tang  Flanders   Glove blood sample 3 Tang Flanders   Blood on Ankle of Sock Janice Black Flanders   Blood on Toe of Sock Tang Flanders   Blood in Entryway Tang Flanders Tang SUV Carpet Stain 1 Janice Black Flanders   Carpet Stain 2 Tang Flanders   Center Console  Janice Black Flanders, Mack Silverman, Tang  Flanders   Steering Wheel Janice Black Flanders, Tang Flanders 6
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A211 Name:___Jane Hall_________________ 1c. The prosecution in the trial has argued that this DNA evidence proves that Tang committed these murders. Based on your answers to questions 1a. and 1b., explain how the prosecution could make this argument. (4 points) The prosecution could make this argument, because of the extremely rare ration that
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