ACT Science Practice Question #1302 (Hard (33)) | Test Citadel
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ACT Science Difficulty: Hard (33)

Digital ACT Science Practice Question #1302

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An evolutionary biology experiment tracked allele frequencies in a population of fruit flies (*Drosophila melanogaster*) over 20 generations: • Generation 0: Allele $A = 0.50$, Allele $a = 0.50$ • Generation 10: Allele $A = 0.72$, Allele $a = 0.28$ • Generation 20: Allele $A = 0.94$, Allele $a = 0.06$ If the population size was maintained at $>10,000$ individuals and no migration occurred, which evolutionary mechanism is most likely responsible for the directional shift in allele frequencies?
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Examine extreme data points: check Wire 4 ($R = 0.068$) which has the highest length (2.0 m) and smallest area (0.5 mm²).

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In a large population without migration, a steady, unidirectional increase in allele $A$ frequency from 0.50 to 0.94 across 20 generations strongly indicates positive directional natural selection favoring phenotype $A$....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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