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Genetic Testing

Genetic Testing. Unit 2-5 Notes Mr. Hefti – Pulaski Biology. 1. Summary of Steps. Gene testing Collect cells (blood sample) Make copies of the DNA (PCR) Separate the DNA (gel electrophoresis). 2. Gel Electrophoresis. DNA moves through gel based on size Smaller fragments

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Genetic Testing

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  1. Genetic Testing Unit 2-5 Notes Mr. Hefti – Pulaski Biology

  2. 1. Summary of Steps • Gene testing • Collect cells (blood sample) • Make copies of the DNA (PCR) • Separate the DNA (gel electrophoresis)

  3. 2. Gel Electrophoresis • DNA moves through gel based on size • Smaller fragments travel faster than larger fragments!!!

  4. 3. Huntington Disease Gene • HD gene contains extra CAG nucleotide repeats, therefore are larger in size than normal gene CAGCAGCAGCAGCAG

  5. 4. Results • Compare patients’ DNA test results to control samples Lane 1 = no sample Lane 2 = Positive control Lane 3 = Negative control Lane 4 = Patient A Lane 5 = Patient B Lane 6 = Patient C Larger DNA fragments end up here Smaller DNA fragments end up here

  6. 5. Example HD Pedigree

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