A victim of murder is found to have scrapings containing skin cel...

Question

A victim of murder is found to have scrapings containing skin cells under several of her fingernails. Genetic analysis confirms that the DNA isolated from these cells came from the same individual and does not match the DNA of the victim. The results shown below are for six CODIS STR markers from the crime scene DNA (from under the victim's fingernails and presumed to be the murderer's), and from three suspects (A, B, and C) who have been detained for questioning about the murder.

Is there a failure to exclude any of the suspects? Explain.

Accepted Answer

Hi, everybody. Let's look at the next question. It says S T R short tandem repeat analysis is a widely used method in DNA fingerprinting or profiling. DNA fingerprinting is a technique used to identify individuals by analyzing their DNA. How many S T R loci are typically analyzed in forensic DNA profiling choice? A 1 to 2 B 5 to C 15 to 20 or D 25 to 30. So let's recall that this analysis involves looking at these S T R regions and looking at the number of repeats of given DNA sequences. And these are highly individual, varying between different people and therefore useful for identifying individuals in forensic uh forensic analysis. But it's very important that this be extremely specific and accurate. Because if you are going to identify a suspect, for instance, on the basis of a DNA analysis, you want to make sure that you're ruling out other people with a very high degree of specificity. So you look at different low and how many repeats there are at this low. And you'd want to look at the number of these that you need to be really certain that this particular profile can only belong to a single individual. And the standard for that is choice C 15 to 20 so 15 to 20 different low for looking at the number of repeats. And this does give a high degree of accuracy and reliability. So again, the widely used standard here choice C 15 to 20 different low. See you in the next video.

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