fossil record gene splicing selective breeding gel electrophoresis
I gave my students this multiple choice question: Newly discovered organisms are now classified based on DNA evidence. Which of the following is most helpful to a researcher classifying a newly discovered organism?

Only one answer is correct among these 4 choices:
- fossil record
- gene splicing
- selective breeding
- gel electrophoresis

Could you tell me which one is correct?

gel electrophoresis