Name_________________________________________________Date_________________Period_______________

5.3 DNA Fingerprinting Practice

Part A: Investigating Crime Scene Evidence When forensic Scientists examine DNA in the lab, each sample appears as a unique sequence of dark bars. Patterns of bars are compared to find a match.

1. Which suspect left their DNA at the crime scene?

2. Was the victims DNA found at the crime scene? Explain.

3. Should either suspect be arrested? Explain.

5. Which suspect most likely left their DNA at the crime scene?

4. Which suspect is most likely the culprit?

6. Does the crime scene DNA match any of the suspects? If so which one(s).

7. List at least 3 sources of DNA that could be left at a crime scene.

Victim

Crime scene

Suspect 1

Suspect 2

Suspect 3

Part B: Determining PaternityWhen genetic scientists examine DNA in the lab, each sample appears as a unique sequence of dark bars. Patterns of bars are compared to determine who is related. Children share half their bands with their mother and half with their father.

Part C: Determining Species RelatednessEvolutional Biologists use DNA profiles to determine how closely species are related.

8. Could any of the children belong to this mother and father? If so which ones?

9. Which male is most likely the father?

11. Which male is most likely the father of Child 1?

12. Which male is most likely the father of Child 2?

Mom Male 1 Male 2 Child 1 Child 2

10. Which male is the father?

13. Which two species amongst the three are most similar?

14. Which of these species is most likely the oldest? Explain.