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Exploring DNA Fingerprinting: Crime Scene Evidence Processing and Radioactive Probes in Forensic Science

Learn how crime scene evidence is processed to extract DNA and how radioactive probes are used in DNA fingerprinting. Discover the fundamentals and investigations in forensic science, including allele, chromosome, DNA fingerprint, DNA probe, gene, and restriction enzyme. Explore the reliability of DNA fingerprinting in family relationships and consider ethical questions about DNA access, genetic screening, and genetic alterations in plants and animals.

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Exploring DNA Fingerprinting: Crime Scene Evidence Processing and Radioactive Probes in Forensic Science

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  1. Chapter 7: DNA FingerprintingDay 1 Objectives: Describe how crime-scene evidence is processed to obtain DNA Describe how radioactive probes are used in DNA fingerprinting Forensic Science: Fundamentals & Investigations, Chapter 7

  2. Do Now: Vocabulary • Allele: an alternate form of a gene • Chromosome: a cell structure that contains genetic information along strands of DNA • DNA Fingerprint: pattern of DNA fragments (also called DNA profiling) • DNA probe: a molecule used to locate a particular sequence or gene on a DNA molecule • Gene: segment of DNA in a chromosome that contains information used to produce a protein • Restriction enzyme: a molecule that cuts a DNA molecule at a specific base sequence

  3. Read p158: DNA Fingerprinting and Family Relationships • In the case described in this scenario, Andrew’s DNA would not be a perfect match with his mother Christiana. Because each person inherits half of his or her DNA from each parent, only half of Andrew’s DNA fingerprint would be an exact match with Christiana’s DNA. • Is that still enough to prove, beyond a doubt, that Andrew is Christiana’s son? Forensic Science: Fundamentals & Investigations, Chapter 7

  4. Homework • After reading p160-162, answer one of the following questions: • Should the government be able to have access to everyone’s DNA? • Should the DNA of relatives of convicted criminals be available? • Should we screen everyone’s DNA at birth to identify possible health issues? • Should we be allowed to genetically alter plants and animals to make food more desirable for human consumption? Forensic Science: Fundamentals & Investigations, Chapter 7

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