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KEY CONCEPT DNA fingerprints identify people at the molecular level.

KEY CONCEPT DNA fingerprints identify people at the molecular level. Based on:. Noncoding regions of DNA Number of nucleotide repeats in particular parts of the genome A person ’ s molecular identity A type of restriction map using gel electrophoresis.

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KEY CONCEPT DNA fingerprints identify people at the molecular level.

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  1. KEY CONCEPT DNA fingerprints identify people at the molecular level.

  2. Based on: • Noncoding regions of DNA • Number of nucleotide repeats in particular parts of the genome • A person’s molecular identity • A type of restriction map using gel electrophoresis

  3. A DNA fingerprint is a type of restriction map. Draw the bands for person B.

  4. (mother) (child 1) (child 2) (father) DNA fingerprinting & probability: • Used for identification • By investigating several parts of the genome, it’s very unlikely that two people would randomly share identical numbers of repeats (multiplying each separate probability of a match)

  5. 1 1 1 1 500 90 120 5,400,000 x x = = 1 chance in 5.4 million people • Individual probabilities are multiplied to find the overall probability of two DNA fingerprints randomly matching. • Several regions of DNA are used to make DNA fingerprints. • By investigating several parts of the genome, it is very unlikely that two people would randomly share identical numbers of repeats (multiplying each separate probability to find the total probability of a match)

  6. Uses of DNA fingerprinting: • evidence in criminal cases • paternity tests • immigration requests • studying biodiversity • Identifying new species • tracking genetically modified crops

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