Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Textbook Question
Chapter CHST3, Problem 3DQ
If you were acting as a defense lawyer in a murder case that used DNA profiling as evidence against the defendant, how would you explain to the jury the limitations that might alter their interpretation of the crime scene DNA profile?
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Should DNA phenotyping be used to identify or convict a suspect?
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1) A forensic scientist is required to collect blood samples from the crime scene and
analyze it to help the investigators understand who participated to the murder.
i) As a first step, the scientist needs to extract DNA. Indicate why red blood cells are not a
good target for the analysis, and list at least two chemicals/compounds that are required to
extract the DNA, explaining why they are used.
ii) The sample has been collected in a small amount, so that (s)he decides to use PCR to
analyze it. Describe why PCR is better suited to address small samples with respect to
Southern blotting and how is selectivity addressed with this technique.
Chapter CHST3 Solutions
Essentials of Genetics (9th Edition) - Standalone book
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- Are there other legitimate means that can be used as a substitute for the polygraph test? Do these alternative media present any privacy concerns?arrow_forwardIdentify when in a crime scene DNA may become mixed.arrow_forwardWhen answering a writing prompt, you should always be sure to include: [select the two answers that apply] An answer to the question (in your own words). Evidence from the text. essay format with as many words as possible.arrow_forward
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- The order in which the different methods should be ranked are as follows: Fingerprint Identification followed by DNA Profiling, Bertillon System, Portrait Parle, and lastly Forensic Odontology. In your own analysis, give justification on its order according to their accuracy.arrow_forward1) Would it be an issue if the sample gathered off the crime victim’s clothes was a blood sample versus the suspect’s sample being hair strands?arrow_forwardQ7 is based on the DNA fingerprint below presented to jurors in a murder trial. Lane 1 represents DNA taken from the murdered victim. Lane 2 through 5 are DNA samples taken from suspects in the crime. Lane 6 is from a bloodstain found near the victim. Q7: Present a brief argument of what can be learned from the DNA evidence presented in the gel above. Hints: a) Which, if any, of the suspects is connected to the crime scene? b) What else is interesting about the DNA fingerprints of two of the other suspects?arrow_forward
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