DNA and Crime

The video tutorial explores the evolution of DNA profiling in crime investigation. Initially, DNA profiling required large samples and was limited to determining blood type. However, advancements led to the development of DNA fingerprinting in 1984, which became a crucial tool in linking suspects to crimes. By 1997, techniques like polymerase chain reaction allowed forensic scientists to create DNA profiles from tiny samples, revolutionizing crime-solving. DNA profiling continues to advance, enhancing forensic science and making the world safer by identifying criminals with minimal evidence.

What percentage of human DNA bases are identical across all individuals?

• 99%

• 100%

• 75%

• 50%

Which technique was developed in 1984 and is known as DNA fingerprinting?

• Polymerase Chain Reaction

• Restriction Fragment Length Polymorphism

• Gel Electrophoresis

• DNA Sequencing

In what year was DNA first used to match an individual to a crime?

• 1997

• 1960

• 1984

• 1987

What is the main advantage of the polymerase chain reaction in forensic science?

• It is a slow process.

• It is only used for blood samples.

• It can create DNA profiles from small samples.

• It requires large DNA samples.

What can a single hair or drop of blood at a crime scene now help identify?

• The criminal

• The time of the crime

• The crime location

• The motive