http://www.youtube.com/watch?v=Wmrwj6DDt-4

What is this?

How did it all start?

• First used on clay tables for business transactions in ancient Babylon

• Then used in China to sign documents in clay seals

• Fingerprints weren't used for identifying criminals until the 19th century (1800s)

• Now: Iphone 5S?

How does fingerprinting work?

How can you record fingerprints?

Crime Scene Fingerprints

• Visible Prints – impression on surface such as blood, dirt, clay

• Latent Prints – sweat and oil reproduce fingerprints on glass, murder weapon

• Can’t see Latent Prints with Naked Eye, only powder, lasers, or light source (which we will do later!)

Another identification method

• DNA analysis of blood, hair, skin

What is DNA?

• Deoxyribonucleic acid

• ZzZzzzzzZZ

What does DNA really mean???

• It codes everything for your body to do

What do we use DNA for?

• Fossils• Paternity tests• Trace relatives• Health for fetus• Criminal investigation• Identify new species• Create family trees• Medicine!

What can twins NOT share?

• Fingerprints!

• They can share identical DNA.

QUESTIONS

1. TRUE or FALSEFingerprints are the tiny ridges, whorls and valley patterns on the tip of each finger.

2. Which is not a use DNA for?A. Family treesB. Dehydration of fruit C. Criminal InvestigationD. Medicine

3. TRUE or FALSETwins have the same Fingerprints.