My final exam for general biology is in 3 hours and I still have one question that I can't seem to answer on my review. I have to pass the final to get credit for the class. The question is..."What is an example of evolution using genetics?"To which I answered,"A large number of houseflies died after the introduction of DDT; most houseflies born today have a resistance to DDT."For reference, DDT is the chemical in bug spray that kills bugs.My instructor has already told me via E-Mail that my answer is right but he wants me to show genotypes. I totally sucked at the chapter with genotypes and phenotypes. Can someone help?Thanks!