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About This Drill
ACT Science — Research Summaries — Drill 4 is a Science practice drill covering Research Summaries. It contains 5 original questions created by Brian Stewart, a Barron's test prep author with over 20 years of tutoring experience.
ACT Research Summaries questions test analysis of experimental design and interpretation of results across multiple studies. This drill presents three experiments on natural selection in peppered moth populations, requiring identification of variables, comparison of results, and evaluation of a simulation model.
Questions in This Drill
- According to Table 1, in the polluted woodland, approximately how much greater was the survival rate of dark moths than light moths?
- In Experiment 1, what was the independent variable?
- The results of Experiment 2 are best explained by which conclusion from Experiment 1?
- Suppose the model in Experiment 3 were run in an unpolluted environment instead of a polluted one, with the selection coefficient of 0.35 now applied against the dark morph. Starting from the same initial dark allele frequency of 0.30, what would most likely happen to the dark allele frequency over the five generations?
- In Experiment 1, the researchers released equal numbers of light and dark moths at each site. What was the most likely reason for this design choice?