42
152
NTA AbhyasNTA Abhyas 2020Biotechnology : Principles and Processes
Report Error
Solution:
Gel electrophoresis separates DNA fragments by size in an agarose gel. DNA samples are pipetted into the sample wells. Application of an electric current at the top (anodal, negative) end causes the negatively-charged DNA to migrate (electrophorese) towards the bottom (cathodal, positive) end. The rate of migration is proportional to size: smaller fragments move more quickly and wind up at the bottom of the gel.