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Microevolution describes evolution on its smallest scale such as the change in allele fre quencies in a population over generations Insects and bacteria are key species to observe microevolution due to their short generation cycles Dichlorodiphenyltrichloroethane DDT is an insecticide used in agriculture DDT was widely in use in the United States from the 1940s until 1972 Scientists studied a particular allele frequency in laboratory strains of the common fruit fly Drosophila melanogaster These strains were collected from flies in the wild in the 1930s and zero al leles were found to confer with DDT resistance In the 1960s the frequency was found to be 40 percent conferring DDT resistance Predict what would happen with the frequency of DDT resistance if another round of data collection was to occur in 2030 among Drosophila melanogaster A B C The DDT resistance frequency would neither increase or decrease due to mutation rates altering the gene to match new pesticides The DDT resistance frequency would neither increase or decrease much due to the lack of DDT usage and it not being a selective advantage anymore The DDT resistance frequency would continue to increase at the same rate as it did from 1930 to 1960 The DDT resistance frequency would decrease rapidly back down to zero since DDT is

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