The FBI and other law enforcement agencies make use of a system called the Combined DNA Index System (CODIS). CODIS records the genetic profiles of people from all 50 states. This allows for comparisons between DNA found at crime scenes and DNA profiles from known offenders. CODIS includes a core of 13 variable loci for each included individual. Select the statement that correctly explains why the FBI and other law enforcement agencies use 13 variable loci for DNA matching. Suspects can be found guilty if their DNA matches one locus found at the scene. Chances are high they will match at least one of 13 loci. DNA samples decompose rapidly, and so forensic investigators test only the 13 strongest and longest-lasting loci in criminal investigations. The likelihood of someone's DNA sample matching 13 loci is extremely small, unless the DNA is from the same person. The average number of suspects who undergo DNA testing for a violent crime is 10, and so at least one is likely to be a match.
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DNA profiling is a forensic technique used to identify individuals by characteristics of their DNA. It is a way of creating a unique "DNA fingerprint" for a person or other organism. Show more…
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A basic DNA-matching method is used by a regional police force to try to identify criminals. This method has a one in 19,198 chance of indicating a match between two samples even when they actually come from different individuals. Assume that the probability of a match is the same for any pair of samples from different individuals and that the events of different individuals matching an unrelated sample are independent. The police force has a DNA sample from a crime scene and also has a bank of DNA samples from 15,220 members of their community. However, the truth is that none of these people had anything to do with the crime. What is the probability that the method finds a match between the crime scene DNA and at least one person whose DNA is stored in the bank of samples?
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A basic DNA-matching method is used by a regional police force to try to identify criminals. This method has a one in 19,198 chance of indicating a match between two samples even when they actually come from different individuals. Assume that the probability of a match is the same for any pair of samples from different individuals, and that the events of different individuals matching an unrelated sample are independent. The police force has a DNA sample from a crime scene and also has a bank of DNA samples from 15,220 members of their community. However, the truth is that none of these people had anything to do with the crime. What is the probability that the method finds a match between the crime scene DNA and at least one person whose DNA is stored in the bank of samples?
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