DNA Fingerprinting

DNA Fingerprinting - a nylon sheet. A nylon sheet is...

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DNA Fingerprinting
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DNA Fingerprint
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Step One Collect the sample! What do you think are the most common sources of DNA samples for forensic scientists?
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Step Two Extract and purify the DNA. Much the same as what we did with the Strawberry!!
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Step Three Cut the DNA! What do we use the cut DNA molecules?
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Step Four Sort the DNA by length! Big pieces = slow Small pieces = fast
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Sort by Length DNA has a negative charge. Electrophoresis machine has a positively charged probe on one end.
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Step # 5 DNA is split and transferred to
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Unformatted text preview: a nylon sheet. A nylon sheet is blotted into the gel and DNA fragments are transferred onto it. Step # 6 Radioactive probes are attached to the DNA fragments. Lets practice!!! DNA strand: AATCCGAATC DNA strand: TACCGATTCG Step # 7 * Nylon sheet with DNA fragments attached to radioactive markers is put into an x-ray machine. End Result!!! Step 8 Analyze and compare results! Do we have a match? blood stain Bob Sue Juan Lakisha Do we have a match? blood stain Bob Sue Juan Lakisha...
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DNA Fingerprinting - a nylon sheet. A nylon sheet is...

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