Unit 7 Forensic Science 1 Activity PDF

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Student Name Anosha Zahid Unit 7: Forensic Science 1 Activity DNA (Ongoing Activity) I. Background Before you dive into DNA analysis, use this link to learn more. 1. What is a DNA fingerprint? – Read this article to learn about the science and procedures behind DNA fingerprinting. How is modern-day DNA profiling (STR analysis) different from the original DNA fingerprinting process? Why is STR analysis preferred today? (three to five sentences) Modern-day DNA profiling (STR analysis) is different from the original DNA fingerprinting process because it relies on micro-satellites rather than mini-satellites. STR analysis produces accurate results and only requires a tiny amount of DNA. STR analysis preferred today because it is very reliable and accurate. II. Ongoing Activity Good news! The partial print found on the doorknob of Dr. Fisher’s apartment has been matched. It belongs to a patient, Bill. You have obtained a sample of Bill’s DNA, as well as DNA from Dr. Fisher’s girlfriend, Lucy, who sometimes visits the apartment. The light hair and dark hair samples found at the crime scene both yielded DNA. You have developed a DNA fingerprint for the samples. Now, it’s time to compare them to the possible suspects. Use the DNA fingerprints below to answer the following questions. 1. Who does the light hair sample belong to? Lucy. 2. Who does the dark hair sample belong to? Bill. 3. Taken at face value, does this DNA evidence incriminate Bill, Lucy, both, or neither? Explain your answer. (two to three sentences) The DNA evidence incriminates Bill and Lucy because the hair samples were found at the crime scene matched with their DNA which means that the DNA shows that they both were present at the crime scene. 4. You call in a special favor to your friend at the FBI, and she runs the DNA samples through CODIS. A match returns. It appears that Lucy has previously been arrested for drug possession and trafficking. Do you think Lucy shot Dr. Fisher? Can you prove it? Why or why not? Refer to the evidence you have collected from the scene and your prior analyses. What other information would you seek in this case? (three to five sentences) I can’t prove at the moment whether Lucy shot Dr. Fisher or not. She is a suspect with her background story of her been arrested for drug possession and trafficking and the DNA evidence found at the crime scene. I would ask how her relationship was with Dr. Fisher was like was it rocky, were they always fighting, did they break up and if she had a motive to potentially murder him and if she did what was it and were there any death threats found at the crime scene and whether or not he knew about about her drug possession and trafficking. I would also ask if Lucy also had a history of violence while under the influence of drugs and whether she was under the influence of drugs at the time of the murder. While the evidence points towards her as the potential killer I still don’t have enough information on her and on the case to be 100% sure it was her who killed Dr. Fisher.

Light Hair DNA

Dr. Fisher’s DNA

Bill’s DNA

Lucy’s DNA

Dark Hair DNA

Dr. Fisher’s DNA

Bill’s DNA

Lucy’s DNA...