At a crime scene a blood sample was found and investigated using gel electrophoresis. Based on the gel, the blood at the crime scene belongs to which of the suspects?

• A. Jenny
• B. Bob
• C. Mike
• D. Lisa
• E. The blood at the crime scene does not belong to any of these suspects.

Answer: (C)

Verified step by step guidance

1. Examine the gel electrophoresis image provided. Each column represents the DNA banding pattern of a different sample: the crime scene blood sample and the samples from suspects Jenny, Bob, Mike, and Lisa.
2. Identify the banding pattern of the crime scene blood sample. Look for the number and position of bands in the first column labeled 'Blood Sample'.
3. Compare the banding pattern of the crime scene blood sample with each suspect's banding pattern. Focus on the number of bands and their positions in the columns labeled with each suspect's name.
4. Determine which suspect's banding pattern matches the crime scene blood sample. A match occurs when the number and position of bands are identical between the crime scene sample and a suspect's sample.
5. Conclude that the suspect whose banding pattern matches the crime scene blood sample is the one whose blood was found at the crime scene. In this case, the banding pattern of Mike matches the crime scene sample.