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DNA Fingerprinting Class 832. LEGO Model of DNA DNA is a molecule in your body. It is a code, which stores instructions for building the “machines” in.

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Presentation on theme: "DNA Fingerprinting Class 832. LEGO Model of DNA DNA is a molecule in your body. It is a code, which stores instructions for building the “machines” in."— Presentation transcript:

1 DNA Fingerprinting Class 832

2 LEGO Model of DNA DNA is a molecule in your body. It is a code, which stores instructions for building the “machines” in your body. It is a double helix. It is a millionth of a millimeter wide. In humans, a molecule of DNA is 200,000,000 bases long.

3 DNA is a Code GGAAAACTAAC CCTTTTGATTG The genetic code is written in A’s, T’s, C’s and G’s. The sequence of A’s, T’s, C’s and G’s uniquely identifies a person, unless they are a twin. That’s why it’s called DNA fingerprinting.

4 Restriction Enzymes are Molecules that Cut DNA at Particular “Words”

5 Restriction Enzyme Cuts Yield Different Sized DNA Fragments 11102

6 Gel Electrophoresis is Used to Separate the Fragments Based on Size

7 Example DNA Fingerprint Column in Gel corresponds to a person’s DNA. It is called a person’s DNA fingerprint. Row corresponds to DNA fragment size.

8 Different People Have Different Restriction Enzyme Cut Sites Resulting in different band patterns on a gel. 1 2 Resulting in different sized DNA fragments.

9 Who did it? Solving a Murder Mystery Using DNA Fingerprinting

10 Given crime scene DNA and suspect DNA you will construct a gel. You will then analyze the gel to find a match between the crime scene DNA and a suspect’s DNA. You will use this information to make inferences about the murders. Solving Our Murder Mystery Using DNA Fingerprinting


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