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DNA Fingerprinting quiz

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  • What is DNA fingerprinting?
    DNA fingerprinting is a technique that uses genetic markers within a genome to identify an individual.
  • What are genetic markers?
    Genetic markers are sequences of DNA with a known location that are easily identifiable and often differ among individuals.
  • What is a polymorphism in the context of DNA fingerprinting?
    A polymorphism is a difference in DNA sequence among individuals, making each person's genome unique.
  • What does SNP stand for and what is it?
    SNP stands for single nucleotide polymorphism, which is a genetic marker that differs by just one nucleotide between individuals.
  • How can SNPs be used in DNA fingerprinting?
    SNPs can be used to identify individuals because they represent unique single-nucleotide differences in their DNA.
  • What is a DNA fingerprint?
    A DNA fingerprint is the combination of all unique genetic markers in an individual's genome.
  • What are short tandem repeats (STRs)?
    Short tandem repeats (STRs) are short repeated DNA sequences, typically 2 to 5 nucleotides long, found in specific regions of the genome.
  • Why are STRs useful for identifying individuals?
    STRs are useful because the number of repeats at specific genomic regions varies among individuals, making them unique identifiers.
  • How are STRs used in forensic science?
    STRs are used to match DNA found at crime scenes with suspects by comparing the number of repeats at specific regions.
  • What does it mean for STRs to be polymorphic?
    Polymorphic means that the number of STRs at a specific region is different for each individual.
  • How many nucleotides long are typical STRs?
    Typical STRs are approximately 2 to 5 nucleotides long.
  • Give an example of how STRs can differ between individuals.
    One individual might have 5 repeats of a specific STR, while another has 3, and a third has 4 at the same genomic location.
  • What is the significance of the unique number of STRs in an individual?
    The unique number of STRs at specific regions allows for individual identification, similar to a fingerprint.
  • What is the relationship between genetic markers and DNA fingerprinting?
    Genetic markers, such as SNPs and STRs, are the basis for creating a DNA fingerprint to identify individuals.
  • How does DNA fingerprinting help solve crimes?
    DNA fingerprinting helps solve crimes by comparing DNA from crime scenes to suspects, using unique genetic markers like STRs.