Thursday, 11 January 2018

Extracting DNA

Last week, we learned that one of the key ways in which archaeologists learn about pre-history is through DNA testing, so we thought we'd give it a try!

We mashed up banana, then mixed it with an extraction liquid made from detergent (to pop open the cells), salt (to provide suspension) and water (to make the mixture thin enough to filter).

 We left the banana mixture filtering overnight.
 In the morning, we poured our condensed banana liquid into fresh containers.
 We added chilled isopropylene alcohol and were fascinated by the swirling milky clouds of DNA that we managed to extract.
We wondered how we could very the investigation, perhaps using different fruit or different strength extraction fluid.