Collection, Documentation, and Preservation of DNA Evidence

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 sample

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.…

1. Forensic investigations: Compare the DNA collected from the crime scene to determine which of the three suspects was present? Is it Suspect 1, 2 or 3 and explain why? Victim Crime Scene Suspect 1 Suspect 2 Suspect 3

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?

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.

Q7 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?

A. 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 1271WS4P

Should DNA phenotyping be used to identify or convict a suspect?

Examine the gel from a Rape investigation below. If you were the DNA analyst you would conclude that: DNA size markers blood sexual assault evidence samples victim |suspect A suspect B female fracțion male fraction 1 2 3 4 5 6 A. Suspect B is excluded as the source of the evidence, but Suspect A cannot be excluded. B. Both Suspects A and B are excluded as the source of the evidence. C. Suspect A is excluded as the source of the evidence, but Suspect B cannot be excluded. D. Suspect B cannot be excluded as a source of the evidence. The results with Suspect A are inconclusive. E. Neither Suspect A or B can be excluded as a source of the evidence.

You are a police investigator assigned to solve a case of house robbery. In your investigation, you discovered a small quantity of blood and a sample of skin in a piece of broken glass from the window where the thief entered. No usable fingerprints were even obtained. What can you do with this samples to help you identify the prime suspect?

Help

State the five basic steps of DNA fingerprinting using the RFLP method. Why do you think the PCR method is of more use in crime scene investigations?

This is forensic science help asap

Discuss the principle of DNA fingerprinting. How would you use the technique to find out a criminal in forensic studies ? Explain.

Elaborate on major themes and time periods for forensics DNA analysis

Directions: The following story is about a crime solved through biotechnological techniques. The techniques used are DNA fingerprinting and polymerase chain reaction (PCR). DNA fingerprinting is a technique in which an individual’s DNA is analyzed to reveal the pattern of particular short nucleotide sequences. This pattern is claimed to be unique to the individual concerned and can thus be used for identification purposes. Polymerase chain reaction, on the other hand, is a technique used to replicate a DNA fragment so as to produce many copies of a particular DNA sequence. Why do you think there’s a need to generate several copies of the DNA? You will learn the answers to this as you go through the story. Read the story carefully and answer the questions that follow.

Directions: The following story is about a crime solved through biotechnological techniques. The techniques used are DNA fingerprinting and polymerase chain reaction (PCR). DNA fingerprinting is a technique in which an individual’s DNA is analyzed to reveal the pattern of particular short nucleotide sequences. This pattern is claimed to be unique to the individual concerned and can thus be used for identification purposes. Polymerase chain reaction, on the other hand, is a technique used to replicate a DNA fragment so as to produce many copies of a particular DNA sequence. Why do you think there’s a need to generate several copies of the DNA? You will learn the answers to this as you go through the story. Read the story carefully and answer the questions that follow.   Questions: 1. How did the investigators conclude that the suspect was indeed the murderer?  2. What if a strand of hair was found in the truck bed instead of a seed pod, do you think it will still lead to the…

53. Darrell was incarcerated for years due to a crime but was exonerated based on DNA evidence. Which of the following is the most likely reason for his false conviction?Group of answer choices Poor DNA testing Eyewitness testimony Video evidence A persuasive prosecutor

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, B

Victim Suspect 1 Suspect 2 Crime Scene 1 Crime Scene 2 Assuming both crime scene samples came from the same location, what can you conclude from this gel image? Both suspects can be placed at the scene of the crime. The victim and suspect 1 can be placed at the scene of the crime. The victim and suspect 2 can be placed at the scene of the crime. Neither suspect can be placed at the scene of the crime.

There 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.

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?

Identify when in a crime scene DNA may become mixed.

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?

Why can a DNA sample not be a reliable source of evidence?