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What are the characteristics/traits of a good forensic DNA scientist?

What are the characteristics/traits of a good forensic DNA scientist?. The Scientific Method. A procedure used to solve problems or answer questions. A way of thinking and looking at the world. A technique used to gather information and reach conclusions. Steps to the Scientific Method.

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What are the characteristics/traits of a good forensic DNA scientist?

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  1. What are the characteristics/traits of a good forensic DNA scientist?

  2. The Scientific Method • A procedure used to solve problems or answer questions. • A way of thinking and looking at the world. • A technique used to gather information and reach conclusions.

  3. Steps to the Scientific Method Hypothesis Experiment Conclusion Observation Then revise the hypothesis If the results do not support hypothesis

  4. Principles of Crime Scene Investigation ______ Document the scene ______ Protect the scene ______ Help the victim ______ Search the scene ______ Photograph and draw location of items of evidence ______ Transport evidence to the laboratory ______ Package evidence

  5. Principles of Crime Scene Investigation • Help the victim • Protect the scene • Document the scene • Search the scene • Photograph and draw location of items of evidence • Package evidence • Transport evidence to the laboratory

  6. Search the Scene • Goal- “no stone is left unturned.” • Patterns and search strategies • Squares and rectangles • Concentric circles • Pie configuration

  7. Presumptive vs. Confirmatory Tests • Presumptive • Sensitive • Not specific =many false positives • Confirmatory • Less sensitive • Specific =few to rare false positives

  8. Blood • Presumptive • Luminol • Phenolphthalin • Hemastix • Confirmatory • Takayama crystal test • ABAcard Hematrace

  9. Luminol

  10. Luminol

  11. Hemastix

  12. ABAcard Hematrace

  13. Diffusion • Diffusion- the spontaneous tendency of a substance (solute or solvent) to move from a more concentrated to a less concentrated area. • T or F. Diffusion results in the uniform distribution of a substance.

  14. Spermatozoa • Presumptive • Ultraviolet light • Brentamine reaction • Confirmatory • Christmas tree stain • PSA or P30 • Microscopy

  15. P30 Analysis- ABAcard

  16. Male Reproductive System Prostatic urethra Spongy urethra Membranous urethra

  17. Salivary Glands

  18. Saliva • Presumptive • Lugol’s reaction • Confirmatory • Phadebas

  19. Phadebas ® Test Positive test Negative test

  20. Fecal Material • Presumptive • Microscopy for undigested materials • Edelman’s Reagent UV • Apple-green fluorescence

  21. Urine • Presumptive • UV Light • Urea • Litmus paper • Creatinine • Jaffe Test

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