Forensic DNA Analysis Concepts

The video tutorial covers the process of handling DNA samples, including pipetting, using loading dye for visualization, and setting up gel electrophoresis. It explains the steps for staining DNA and discusses the forensic implications of DNA evidence, emphasizing the need for additional evidence beyond DNA matches to establish guilt in a crime scene investigation.

What is the purpose of adding a striking enzyme to DNA samples?

• To increase the DNA volume

• To change the DNA color

• To cut the DNA into pieces

• To visualize the DNA

What are the two dyes that make up the loading dye?

• Methylene blue and cyan blue

• Methylene blue and cyan Oh blue

• Cyan blue and red dye

• Red dye and methylene blue

Why is a DNA ladder used in the gel loading process?

• To provide a size reference

• To change the DNA color

• To control the temperature

• To increase the DNA volume

What happens to the buffer during the electrophoresis process?

• It becomes ionized

• It becomes deionized

• It changes color

• It evaporates

What is the purpose of staining the agarose gel overnight?

• To make the gel more solid

• To visualize the DNA fragments

• To change the gel's color

• To increase the gel's size

What is the main limitation of using DNA evidence alone in a forensic investigation?

• It can only link a suspect to a crime scene

• It is always inaccurate

• It is too expensive

• It takes too long to analyze

What additional evidence is needed to charge someone with a crime?

• A confession

• More DNA samples

• Motive and other evidence

• A witness statement

What is the probability of two people having the same DNA?

• 1 in 3 billion

• 1 in 3 million

• 1 in 3 thousand

• 1 in 3 hundred

What can a suspect claim if their DNA is found at a crime scene?

• They were framed

• They were there but did not commit the crime

• They were never there

• They have an identical twin

What is the role of a forensic scientist when DNA matches a suspect?

• To immediately arrest the suspect

• To find additional evidence

• To close the case

• To ignore the DNA evidence