Criminal Justice Practice Exam

With DNA profiling, a unique genetic profile can be derived from ___ found at the scene of a crime.

1. all of the answers are correct

2. semen

3. hair

4. blood

The correct answer is: all of the answers are correct

DNA profiling is a forensic technique that analyzes an individual's unique genetic makeup, allowing for the identification of that individual through biological evidence. The reason "all of the answers are correct" is accurate is that DNA can be extracted and profiled from various biological materials, each capable of providing a unique genetic profile. Semen is a significant source of DNA, especially in sexual assault cases, as it contains the genetic material of the individual from whom it originated. Similarly, hair can also provide DNA, particularly if the hair has its root attached, as this portion contains follicular DNA that is unique to the individual. Blood is another potent source of DNA, as it contains numerous cells that house genetic information. Therefore, since semen, hair, and blood can all yield unique genetic profiles, indicating an individual's identity when found at a crime scene, it makes sense that the correct answer encompasses all these options as valid sources for DNA profiling. The ability to use multiple types of evidence for DNA analysis enhances the reliability of investigations in tracing individuals involved in criminal activities.