Genomics, Biotechnology, and DNA Analysis
Tools for Studying DNA
Sequencing and Genomics
DNA sequencing reveals the order of nucleotides in a genome. Genomics extends beyond single genes to study structure, function, variation, and interactions across the entire genome.
PCR and Gel Electrophoresis
Polymerase chain reaction amplifies DNA using cycles of denaturation, annealing, and extension. Gel electrophoresis separates DNA fragments by size because DNA is negatively charged and migrates toward the positive electrode.
Common DNA Technologies
| Technique | Main Use |
|---|---|
| PCR | Amplify a target DNA segment |
| Gel electrophoresis | Separate DNA fragments by size |
| DNA sequencing | Determine nucleotide order |
| CRISPR | Edit targeted DNA sequences |
PCR Logic
PCR can exponentially amplify DNA. After cycles, ideal product amount scales approximately as .
What is the main purpose of PCR?
PCR produces many copies of a chosen DNA region.
Correct answer: To amplify a specific DNA segment
Why do smaller DNA fragments move farther in a gel?
Fragment size affects migration distance.
Correct answer: They experience less resistance moving through the gel matrix.
Which tool is most associated with targeted genome editing?
CRISPR is widely used for targeted genome editing.
Correct answer: CRISPR
Forensics and Medicine
Genetic analysis supports disease diagnosis, ancestry testing, paternity testing, pathogen tracking, and forensic identification.
What does sequencing tell you that PCR alone does not?
PCR amplifies DNA, but sequencing reads its composition.
Correct answer: Sequencing reveals the exact nucleotide order.