Loaded into first lane of this gel is a DNA sample from a crime scene. The rest of the lanes contain DNA samples from various suspects. Which suspect was likely present at the crime scene? Spec 1 Dad 1 Spect Hilang I Spect 11
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- 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?THe 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?Help
- Lab #3 Part B Comparison Specimen 2 and 3 with Exemplar 1.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?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?
- 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.Can you please check my answer and make sure it is correct. Question: How can DNA evidence be used to convict or exonerate a defendant? Why is DNA evidence so powerful? Answer: DNA evidence can be used to perform DNA profiling to determine the genotype of the specific DNA sample. With just a small amount of DNA, PCR can produce billions of copies of that specific segment. The segments that are used are from non-coding regions that contain STR’s or short tandem repeats. These very short DNA sequences are repeated and are specific to individuals because we inherit them from our mother and father. Gel electrophoresis separates the PCR products based on their size and each band is compared to the allele ladder. This process helps to identify the alleles present in the original samples. DNA profiling is performed at many loci to be able to tell the genetic difference between different individuals with a lot of certainty. The DNA from the different suspects is compared to the allele…1) Make up a crime scene scenario (or find a real one) in which DNA from a nonhuman provided critical evidence.
- 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.Whole blood collected for DNA-typing purposes mustbe placed in a vacuum containing the preservative___________.HEADGEAR PHYSICAL DESCRIPTION OF PERPETRATORS PERPETRATOR A. Stocking Cap 1. B. Cowboy Hat C. Baseball Cap PERPETRATOR D. Ski or Watch Cap E. Skull Cap F. Beret/Military G. Straw Hat or Fedora H. Masked OUTERWEAR A. Sweatshirt or Jogging Jacket B. Leather, Suede or Fur Trimmed C. Military D. Ski Jacket Gang, Team or School Jacket 2. E. F. Sweater or Vest G. Overcoat or Topcoat H. T-Shirt or Tank Top OTHER CLOTHING ACCESSORIES HEADGEAR COLOR (see color codes below) PERPETRATOR 1. 2. OUTERWEAR COLOR (see color code below) PERPETRATOR 1. 2. PERPETRATOR A. Messy/Dirty/Torn Clothes H. Dress/Skirt B. Well Dressed 1. Scarf/Bandana C. Slacks J. Jewelry (specify) 2. PERPETRATOR D. Shorts E. Jeans F. Uniform/Work Clothes G. Sweat/Jogging Pants FOOTWEAR K. Tools or Keys L. Bag or Briefcase M. Glasses 1. 2. 1. 2. PERPETRATOR A. Jogging Shoes B. Dress Shoes C. Work or Hiking Shoes D. Cowboy Boots E. Sandals F. Barefooted IMPERSONATION OF: A. Law Enforcement Officer B. Security Guard C. Male D.…