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Forensic Science

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  1. Forensic Science

  2. Daily Notes • Describe how science can be used in a criminal investigation.

  3. Forensic Science • Uses science to answer questions related to legal issues • Can involve – • Chemistry • Anthropology • Entomology • Botany • Toxicology • Computers

  4. Forensic Science • Episode from Dragon Fly TV http://pbskids.org/dragonflytv/show/forensics.html Answer the questions in your handout!!!

  5. Fingerprints • Patterns exist on human fingertips • Friction Ridges – various shapes • ID individuals • Collection- tape, powder • Criminal Investigations

  6. Fingerprint Activity • Website for textbook • Procedure • Create 2 inch x 3 inch graphite patch on index card • Rub your index finger on graphite patch • This will be demonstrated in class by teacher • Carefully press a 2 inch piece of tape on finger to collect fingerprint • Gently peel off tape and press into onto your handout • Compare your fingerprint to examples provided and identify your pattern • Complete handout

  7. Fingerprint Patterns

  8. Class Data - Fingerprinting

  9. Ticket out the Door • Turn in your handouts for the video and fingerprinting activity.

  10. DNA Analysis Forensic Science

  11. Daily Notes • Explain the role of DNA in organisms.

  12. DNA • Hereditary material • DNA is different for every individual • Except for identical twins • Can be used like a fingerprint

  13. DNA Analysis • Identification tool • Test paternity • Other family relationships • ID suspect – connect to crime scene • ID victim

  14. Electrophoresis Lab - SAFTEY • Wear safety glasses at all times • Wear gloves at all times • Follow all procedures correctly • I will be VERY STRICT with this lab – SAFETY 1st

  15. Electrophoresis

  16. Electrophoresis

  17. Micropipette Practice

  18. Load the Gel

  19. Run Electrophoresis

  20. Procedure - Record everything • Place your gel in the electrophoresis machine • Wells should face negative electrode (Black) • Pour 400ml of buffer solution into gel • Load gel with each of the three DNA samples • Place lid with wires on electrophoresis apparatus • Plug wires into power source – DO NOT MIX COLORS • Turn on power source – use 150 volts • Run time = 35 min • Turn off power source • Disconnect wires • Teachers will assist with following analysis

  21. Look at your Sample

  22. Forensic DNA and Whales • Tracking down illegal whaling • http://www.youtube.com/watch?v=gueKwcoSj7I

  23. DNA Analysis Forensic Science

  24. DNA Bands

  25. Not the mama!!! ?

  26. Who are the parents? • DNA paternity test • Review genetic inheritance • 50% = Mom’s DNA • 50% = Dad’s DNA • Each group will be given a set of DNA bands • Determine which baby belongs to each couple. • Record your information on your worksheet

  27. Issues with DNA and Forensics • Mistakes in procedure • Contaminated samples • Chimeras http://www.youtube.com/watch?v=VyS2CwNBABo

  28. Ticket out the Door • On the back of your worksheet answer the following: • Is it possible for a child to have a DNA band that is not found in the mother’s DNA? Explain your answer.