A scientist determines that the following mutation has likely occurred in a fruit fly's DNA to change the shape of the wing.



The scientist claims that using gel electrophoresis will allow them to detect which DNA strand has the mutation and which does not.

Why will this work?

The DNA has different lengths, and gel electrophoresis will separate the strands by length showing the mutated gene is shorter than the original gene.


The strands have the same amount of thymine in them, so this technology cannot be used to compare the two genes.


The strands have the same amount of guanine in them, so this technology cannot be used to compare the two genes.


The DNA has different base pairs, and gel electrophoresis will separate the strands by comparing the base pairs, showing the mutated gene has one less A-T base pair.