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What type of DNA is most commonly used in forensic analysis?. Mitochondrial DNA (mtDNA). Y-chromosome DNA (Y-STR). Autosomal Short Tandem Repeats (STRs). Single Nucleotide Polymorphisms (SNPs).

What is the function of the DNA chain of custody?. To ensure the integrity and traceability of biological evidence from collection to analysis. To store DNA samples in a secure location. To amplify DNA samples for further testing. To protect DNA samples from environmental degradation.

What technique is used to amplify small quantities of DNA?. Polymerase Chain Reaction (PCR). Sequencing. Electrophoresis. Southern Blotting.

Mitochondrial DNA (mtDNA) is inherited from: The mother only. The father only. Both parents equally. The paternal grandmother.

What is Random Match Probability (RMP)?. The probability that two unrelated individuals share the same genetic profile. The probability of DNA contamination during analysis. The error rate of PCR amplification. The chance of finding a common ancestor between two individuals.

Which of the following is a limitation of Y-STR analysis?. It cannot distinguish between males within the same paternal lineage. It is highly sensitive to female DNA contamination. It requires a large amount of DNA for amplification. It is not useful for identifying multiple male contributors in a mixture.

What is 'touch DNA'?. DNA transferred from an individual to a surface through touch. DNA found in touch screen devices. DNA analysis performed on fingerprints. DNA obtained from a single touch of a donor.

What is the primary advantage of using miniSTRs over standard STRs in degraded DNA samples?. MiniSTRs amplify shorter DNA fragments, making them more robust against degradation. MiniSTRs are more informative due to a higher number of repeats. MiniSTRs eliminate the need for PCR amplification. MiniSTRs provide information about the individual's phenotype.

What is the purpose of an allelic ladder in STR analysis?. To translate the physical length of DNA fragments into specific alleles. To amplify the DNA sample. To reduce stutter artifacts. To purify the DNA sample.

What is a limitation of DNA databases in forensic investigations?. They may not contain profiles of all potential suspects. They provide definitive proof of guilt. They are only useful for identifying victims. They are not subject to privacy concerns.

What is the primary function of Quality Control (QC) in a forensic laboratory?. To ensure the accuracy and reliability of analytical results. To develop new forensic techniques. To manage the overall quality assurance system. To reduce the cost of DNA analysis.

What is the significance of the Hardy-Weinberg principle in forensic genetics?. It allows for the calculation of genotype frequencies from allele frequencies in a population. It explains the process of DNA replication. It is used to identify the source of DNA contamination. It determines the inheritance pattern of mitochondrial DNA.

What is the main challenge in interpreting mixed DNA profiles (from multiple contributors)?. Distinguishing the DNA of individual contributors and accurately estimating their number. The DNA is always degraded in mixed samples. STR analysis is not possible with mixed DNA. The allelic ladder cannot be used with mixed profiles.

What is the role of the prosecutor in a forensic investigation?. To interpret the scientific evidence and present it in a legal context. To collect biological samples from the crime scene. To perform DNA analysis and generate profiles. To develop new DNA testing technologies.

What does the term 'heteroplasmy' refer to in mitochondrial DNA analysis?. The presence of more than one type of mtDNA within a cell or individual. The complete absence of mtDNA in a sample. The mutation of mtDNA due to environmental factors. The inheritance of mtDNA from both parents.

What is the main advantage of using SNPs (Single Nucleotide Polymorphisms) in forensic analysis, especially with degraded DNA?. SNPs are typically shorter than STRs and more resistant to degradation. SNPs are inherited only from the father. SNPs are not affected by PCR inhibition. SNPs provide information about the individual's phenotype.

What is the purpose of the Y chromosome in forensic genetics?. To trace paternal lineage and identify males in a mixture. To identify maternal lineage. To determine the age of the individual. To detect drug use.

What is the main challenge in interpreting low copy number (LCN) DNA profiles?. Increased risk of drop-out (failure of an allele to amplify) and drop-in (unexplained peaks). The DNA is always highly degraded. The analysis requires specialized Y-STR markers. The statistical calculations are simpler for LCN profiles.

What is the role of the DNA profile in legal proceedings?. It serves as potential evidence that requires interpretation within the broader context of the case. It provides definitive proof of guilt. It is automatically accepted as conclusive evidence. It replaces the need for witness testimony.

What is the primary goal of forensic genetics?. To identify individuals by analyzing their genetic material. To study the evolutionary history of human populations. To develop new methods for diagnosing genetic diseases. To analyze non-human DNA samples for environmental monitoring.