DNA Profiling in Forensic Science

The video discusses the BTK case in Kansas, highlighting how DNA profiling has evolved over the years. Initially, DNA evidence was limited, but advancements in technology, such as PCR, have allowed for more efficient profiling even from small or degraded samples. Despite concerns about the age of the evidence, quality DNA profiles were eventually obtained, aiding in the investigation.

What was the primary challenge in solving the BTK case before DNA profiling?

• Lack of witnesses

• Insufficient forensic technology

• Uncooperative suspects

• Inadequate police resources

By 2004, how had crime fighters improved their use of DNA profiling?

• By collaborating with international agencies

• By increasing the number of crime labs

• By developing faster and more accurate DNA profiling methods

• By using more advanced fingerprinting techniques

What type of evidence was initially submitted in the BTK case?

• Hair strands

• Blood samples

• Clothing and fingernail scrapings

• Footprints

What is the natural process that allows DNA to replicate itself?

• Photosynthesis

• Cell division

• DNA transcription

• Protein synthesis

What is the significance of DNA's ability to replicate itself in forensic science?

• It enables the identification of genetic disorders

• It facilitates the amplification of evidence for testing

• It helps in determining the age of a sample

• It allows for the creation of synthetic DNA

What is the main advantage of using PCR in DNA profiling?

• It can analyze larger DNA samples

• It can amplify DNA from very small samples

• It can determine the gender of the DNA source

• It can identify the age of the DNA sample

How does PCR help in forensic investigations?

• By creating a visual representation of DNA

• By amplifying small DNA samples for analysis

• By identifying the source of DNA

• By preserving DNA samples for future use

What was a major concern regarding the BTK DNA samples?

• They were lost

• They were mislabeled

• They were too degraded

• They were contaminated

What was the outcome of the DNA analysis in the BTK case?

• Quality profiles were obtained from the samples

• The DNA was too degraded to use

• The DNA did not match any known profiles

• The suspect was exonerated

What was the final breakthrough in the BTK case?

• The suspect was caught in the act

• A new witness came forward

• DNA evidence provided a genetic snapshot of the suspect

• A confession was obtained