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In a crime lab, what precautions should be taken to make sure the DNA wasn't contaminated?
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- How could knowing the nucleotide base sequence of a piece of DNA be important to someone trying to solve a crime?Should DNA phenotyping be used to identify or convict a suspect?You are working as a CSI analyst. You collected DNA at a crime scene that is from the suspect but do not have enough to run a test to determine who the suspect is. Please discuss what you would do to attain more of the DNA and how to test the DNA to determine who the suspect is.
- STR analysis was performed on blood from a crime scene as well as from three suspects. The crime scene DNA is marked Evidence. Which suspect’s DNA matches the evidence?To pinpoint a Criminal, Forensic Department uses the technique called? A) DNA Editing B) DNA Splicing C) DNA Fingerprinting D) DNA AmplificationHow the nucleotide base sequence of a piece of DNA is important to know someone to solve a crime?
- 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.what does DNA tests tell us about the time frame or circumstances under which DNA came to be associated with an evidence sample? It depends on the sample Who was the primary wearer of an article of clothing If the DNA was depositied as a part of the crime or from innocent contact The order in which the individuals contributed DNA to an evidence sampleSince 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?
- What 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?No need to provide evidence or side answers. My teacher like to answer the question only :)What is the biological and non-biological samples used in forensic DNA investigations?
