DNA Profiling Review

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What is DNA profiling?

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DNA profiling is a forensic technique used to identify individuals by analyzing their unique DNA characteristics.

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What are short tandem repeats (STRs)?

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STRs are repeating sequences of DNA that vary in length among individuals, making them useful for identification in DNA profiling.

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What is trace evidence?

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Trace evidence refers to small, often microscopic materials that can be transferred from one location to another, such as hair, fibers, or paint.

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Why is trace evidence important in forensic investigations?

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Trace evidence can link a suspect to a crime scene or victim, providing crucial information in criminal cases.

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What are the challenges of collecting trace evidence at a crime scene?

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Trace evidence can be easily contaminated or lost, making it difficult to collect and preserve.

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What ethical concerns are associated with DNA profiling?

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DNA profiling raises concerns about privacy, potential misuse of genetic information, and the implications of false positives.

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How does DNA profiling assist in criminal investigations?

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DNA profiling helps to identify suspects, exonerate the innocent, and establish connections between evidence and individuals.

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What is the significance of the polymerase chain reaction (PCR) in DNA profiling?

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PCR is a technique used to amplify small amounts of DNA, making it possible to analyze even trace amounts of genetic material.

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What role do databases play in DNA profiling?

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Databases store DNA profiles from known individuals and crime scenes, allowing for comparisons and potential matches.

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What is the difference between nuclear DNA and mitochondrial DNA?

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Nuclear DNA is inherited from both parents and is unique to each individual, while mitochondrial DNA is inherited only from the mother and is less variable.