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Selection Across Generations [Mini Skill]
Grade Level
AP Biology
APB.354 Selection Across Generations [Mini Skill]
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Students are evaluating whether a graph truly supports natural selection in meadow snails. The left-coiling shells phenotype is heritable. A local predator handles right-coiling shells more easily. Which description best meets the evidence standard?
A
A graph shows the left-coiling shells phenotype is common among adults after a storm, but the next generation returns to nearly the original frequency.
B
A graph shows the frequency of the left-coiling shells phenotype increasing only among older age classes sampled in one year, without generation-to-generation data.
C
A graph shows a higher mean trait value, but it pools all offspring and does not compare reproductive success of individuals showing left-coiling shells versus right-coiling shells.
D
A graph links phenotype-specific reproduction to population change: individuals showing left-coiling shells produce more surviving offspring, and the frequency of the left-coiling shells phenotype rises in the next generations.
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