Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 15, Problem 14TYU
Summary Introduction
To determine: The suspect’s DNA that matches the evidence as shown in the given figure.
Introduction: Short tandem repeats (STRs) are 3-7 base pairs repetitive sequence elements that are scattered throughout the human genome. These polymorphic loci can be amplified and compared with the standard sample to know about the origin of biological samples.
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DNA Sample : Blood Stain collected from handle
of knife
blood
Bob
Sue
John
Lisa
stain
1. What do you notice about the black lines?
2. How do we read the gel electrophoresis?
3. Which sample are we comparing Bob, Sue,
John, and Lisa's DNA to?
4. How do they compare?
You are a forensic scientist in charge of DNA samples in a case where a man was murdered. You conduct gel electrophoresis on the samples to determine the DNA profile of the samples. The rows of bands have been marked to make it easier to reference the bands. The sample marked 'evidence' came from under the victim's fingernails, likely indicating a struggle. There are two suspects in the case, both of whom are brothers, they are marked suspect 1 and suspect 2, for brother 1 and brother 2, respectfully. Does the evidence collected match the DNA profiles of either brother? If yes, which one? If no, then would it be likely that the actual criminal is a family member of the brothers? If yes, what could the relation be (mom, dad, cousin, aunt, or uncle)?
Note: there is a sister in their family, their parents are both still alive, and they have a robust extended family. The brothers are not twins.
Questions:
Answer questions 1 to 3 about this gel electrophoresis.
1. Which color represents the smallest DNA fragment?
(explain)
2. If “A" is the crime scene and B to E are suspects. Do
you have any match? (Why or Why not)
3. Is there a possibility that any of the suspect related
to the person who committed the crime? Explain.
Chapter 15 Solutions
Biology (MindTap Course List)
Ch. 15.1 - Prob. 1LOCh. 15.1 - Explain how gel electrophoresis is used to...Ch. 15.1 - Describe how PCR is used to amplify a specific...Ch. 15.1 - Compare the possible differences between a...Ch. 15.1 - Prob. 1CCh. 15.1 - Different forms of a protein are produced in the...Ch. 15.1 - What advantages does the PCR method have over gene...Ch. 15.2 - Describe the features of a typical CRISPR locus in...Ch. 15.2 - Explain the function of CRISPR in bacterial cells.Ch. 15.2 - Compare CRISPR-based endonucleases with...
Ch. 15.2 - Prob. 8LOCh. 15.2 - Prob. 1CCh. 15.2 - Prob. 2CCh. 15.2 - Prob. 3CCh. 15.3 - Prob. 9LOCh. 15.3 - Prob. 10LOCh. 15.3 - Discuss how qPCR, DNA microarrays (DNA chips), and...Ch. 15.3 - Explain how you would compare the expression of a...Ch. 15.3 - Prob. 2CCh. 15.4 - Describe how genome-wide association studies have...Ch. 15.4 - Explain how targeted gene silencing and knockout...Ch. 15.4 - Prob. 1CCh. 15.5 - Describe at least one important application of DNA...Ch. 15.5 - Prob. 1CCh. 15.5 - What are short tandem repeats (STRs), and why are...Ch. 15.5 - Why do gene targeting and mutagenesis screening in...Ch. 15.6 - Prob. 15LOCh. 15.6 - Prob. 16LOCh. 15.6 - Prob. 1CCh. 15.6 - Prob. 2CCh. 15.7 - Describe at least two safety issue associated with...Ch. 15.7 - What are some of the environment concerns...Ch. 15 - A plasmid (a) can be used as a DNA vector (b) is a...Ch. 15 - DNA molecules with complementary sticky ends...Ch. 15 - Prob. 3TYUCh. 15 - Which technique rapidly replicated specific DNA...Ch. 15 - Prob. 5TYUCh. 15 - A cDNA clone contains (a) introns (b) exons (c)...Ch. 15 - Prob. 7TYUCh. 15 - Gel electrophoresis separates nucleic acids on the...Ch. 15 - A CRISPR locus in a bacterium contains (a) short...Ch. 15 - DNA molecular with complementary sticky ends...Ch. 15 - These highly polymorphic molecular markers are...Ch. 15 - Prob. 12TYUCh. 15 - Prob. 13TYUCh. 15 - Prob. 14TYUCh. 15 - EVOLUTION LINK DNA technology, such as the...Ch. 15 - SCIENCE, TECHNOLOGY, AND SOCIETY What are some...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- The following gel shows the results of a crime scene investigation. Lane 1 shows a DNA sample that was obtained from the scene of a crime (there was evidence of the criminal cutting himself, so it's the criminal's blood sample that produced the DNA bands in lane 1). Lanes 2-7 shows a DNA sample from six potential suspects held in connection with the crime. Arrange the bands labeled A, B, C, D from largest to smallest. 1 2 3 4 5 6 7 OC, A, D, B A, B, C, D OB, D, A, C O D, A, C, Barrow_forwardWhat does a guy need to do (e.g. how different does his DNA profile need to be?) to be excluded as a possible contributor to a DNA profile from an evidence sample?arrow_forwardTHe DNA profiles of five people potentially involved in a robbery are shown in DNA Profile #2. The profile on the left side was obtained from DNA belongíng the robber. The four other profiles were obtained from the suspects. Which of the potential suspects is most likely the robber?arrow_forward
- Gel Electrophoresis is used often in forensics. Look at the following gel to the left. From the evidence DNA, which individual matches the DNA evidence left at the crime scene?arrow_forward1) Make up a crime scene scenario (or find a real one) in which DNA from a nonhuman provided critical evidence.arrow_forwardThere are two missing fishermen. Multiple human remains were found in the shark. Are the remains (Samples 01, 02, and 03) from one person, two, or three? Show your evidence.arrow_forward
- Should DNA phenotyping be used to identify or convict a suspect?arrow_forwardBased on the bands in the image below, which suspect was at the crime scene? Crime DNA Supeets Suspect 1 Suspect 2 Suspect 3 Suspect 1arrow_forwardRefer to the DNA profiles comparing the DNA obtained from the three suspects with the crime-scene DNA. Use a ruler to align the bands found under the crime-scene DNA with any of the bands found in the suspects’ DNA. Place the ruler at the bottom of the bands. Take notes on whether any of the suspects’ DNA shares the same bands as the crime-scene DNA. Analyze your notes on each suspect’s DNA profile. Do any suspects share all the DNA bands found in the evidence DNA?arrow_forward
- Since DNA anaylsis is specific to human body fluids such as blood, why do Crime Scene Investigators even bother with doing field test for biological fluids? Why not submit all samples that might have any kind biological fluid to the lab?arrow_forwardEnding ridge, bifurcation, dot, and island are exmaples of some of the characteristics used in fingerprint identifications, which are known as fingerprint...arrow_forwardA. Use your pencil to find out if the DNA of the suspect agrees with the DNA from the evidence in Figure 5. Circle your answer. YES NO B. Use your pencil to find out if the DNA of the suspect matches the DNA of the evidence in Figure 6. Circle your answer. YES NO E Figure 5 s " E Figure 6 2. In Figures 7 and 8 you will see if there is HORIZONTAL agreement or matching between suspect and evidence. Use your pencil to make these matches. Underline your choice. A. Suspect DNA and Evidence DNA (match, don't match) in Figure 7. A. Suspect DNA and Evidence DNA (match, don't match) in Figure 8. S E Figure 7 1 #11111 11 ||||||| 1 E Figure 8 1271WS4Parrow_forward
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