Question

describe the importance of dna as forensic evidence beyond simply identifying dna from a crime scene.
your answer
which of the following is true regarding dna collection?
dna can only be collected from blood evidence.
dna has a relatively short life and will degrade quickly.
dna can be extracted from substances as small as a nanogram
dna profiling is only conducted in rape and murder cases.
period
choose

Explanation:

First Sub - Question (Describe the importance of DNA as forensic evidence beyond simply identifying DNA from a crime scene)

DNA in forensics, beyond identification, can link multiple crime scenes (showing a serial offender's pattern), exonerate the innocent (by proving they weren't at the scene), establish family relationships in cases like missing persons, and provide insights into the perpetrator's traits (e.g., ancestry from DNA analysis) to narrow down suspects. It also helps in cold cases by re - examining old evidence with new DNA tech.

• Option 1: DNA can be collected from many sources like hair, saliva, not just blood. So this is false.
• Option 2: DNA can be stable for long periods under proper conditions (e.g., in bone or dried samples), so it doesn't always degrade quickly. This is false.
• Option 3: Advanced techniques allow DNA extraction from very small amounts, even nanogram - sized substances. This is true.
• Option 4: DNA profiling is used in various cases, not just rape and murder (e.g., theft, assault). This is false.

Answer:

DNA as forensic evidence, beyond identification, links crime scenes (revealing serial crimes), exonerates the innocent, establishes family ties (e.g., in missing persons cases), provides perpetrator trait insights (e.g., ancestry), and solves cold cases via new tech.

Second Sub - Question (Which of the following is true regarding DNA collection?)