My favorite activity this year was definently the karoke project. It was fun being able to express our creativity as well as the review. It forced us to use our brains and really review what was learned.
My least favorite was probably not being given notice of the benchmark. Unfortunently, I was unprepared and was one point away from bombing it.
If I could change one thing, it would be to have more karoke projects. :D
Thursday, January 13, 2011
Thursday, January 6, 2011
Blog 13 How has DNA profiling changed the way we investigate crimes? What are the two main tests?
DNA profiling has helped change the way we investigate crimes by helping to narrow down the options exponentially. DNA profiling has created a new form of looking at crimes. All the evidence can be DNA tested and therefore breakdown the possible victims. The two main types of DNA profiling are:
PCR Analysis
Polymerase chain reaction (PCR) is used to make millions of exact copies of DNA from a biological sample. DNA amplification with PCR allows DNA analysis on biological samples as small as a few skin cells. With RFLP, DNA samples would have to be about the size of a quarter. The ability of PCR to amplify such tiny quantities of DNA enables even highly degraded samples to be analyzed. Great care, however, must be taken to prevent contamination with other biological materials during the identifying, collecting, and preserving of a sample.
STR Analysis
Short tandem repeat (STR) technology is used to evaluate specific regions (loci) within nuclear DNA. Variability in STR regions can be used to distinguish one DNA profile from another. The Federal Bureau of Investigation (FBI) uses a standard set of 13 specific STR regions for CODIS. CODIS is a software program that operates local, state, and national databases of DNA profiles from convicted offenders, unsolved crime scene evidence, and missing persons. The odds that two individuals will have the same 13-loci DNA profile is about one in a billion..
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