How do you look at DNA? – Genes Zone March 2010

Question: How do you look at DNA?

Asked by jordanhutchy to Kerstin on 18 Mar 2010 in Categories: Test methods.
- Kerstin Zechner answered on 18 Mar 2010:
  
  The main way we look at DNA is by running a sample on a gel through an electric current. Because DNA has a negative charge, it will run towards the positive pole. The gel we run the DNA on will stop bigger molecules from running towards the positive pole, but smaller ones can fit through the gaps of the gel. This way we can determine the length of the DNA fragments too. A chemical called ethidium bromide attaches to the DNA and glows when put under UV. This is how you can visualise the DNA.

Question: How do you look at DNA?