PCR and DNA Fingerprinting Concepts

DNA fingerprinting is a revolutionary technology used in fields like criminal justice and genetic research. It involves distinguishing individuals using DNA samples, primarily through PCR amplification of short tandem repeats (STRs). The process begins with primers attaching to DNA regions, followed by amplification via PCR, creating numerous copies of variable DNA regions. Gel electrophoresis then separates these copies based on size, allowing for analysis and comparison with known samples. Despite being cost-effective and requiring minimal specimens, PCR has limitations like lower accuracy and contamination risks. Nonetheless, it remains crucial in DNA fingerprinting.

What is one of the primary applications of DNA fingerprinting?

• Weather forecasting

• Criminal justice

• Space exploration

• Agricultural development

What is the role of short tandem repeats (STRs) in DNA fingerprinting?

• They are used to color the DNA samples.

• They help in distinguishing between different species.

• They provide a unique pattern for individual identification.

• They are used to amplify the entire DNA sequence.

What is the purpose of primers in PCR amplification?

• To change the DNA sequence

• To attach to a non-variable region of DNA

• To terminate the DNA sequence

• To degrade the DNA sample

What is the main function of the polymerase chain reaction (PCR) in DNA fingerprinting?

• To create thousands of copies of a DNA region

• To change the DNA sequence

• To destroy unwanted DNA

• To color the DNA samples

How does gel electrophoresis separate STRs?

• By their temperature

• By their size

• By their weight

• By their color

Why is the size of STRs important in gel electrophoresis?

• It determines the color of the DNA bands.

• It affects how far they travel through the gel.

• It determines the temperature of the gel.

• It changes the DNA sequence.

What is the final result of comparing STR sizes in DNA fingerprinting?

• A genetic signature

• A weight chart

• A color pattern

• A temperature map

What is a key advantage of PCR amplification in DNA fingerprinting?

• It requires a large amount of specimen.

• It is less costly and time-consuming.

• It is more accurate than all other methods.

• It eliminates all risks of contamination.

Which of the following is a limitation of PCR amplification?

• It is less accurate than RFLP.

• It cannot be used for human DNA.

• It requires a large amount of DNA.

• It is extremely expensive.

What is a potential risk associated with PCR amplification?

• It can increase the temperature of the gel.

• It can lead to amplification contamination.

• It can cause DNA to change color.

• It can make DNA samples heavier.