Based on the Experiment in Which Drosophila Flies Were Raised

question 130

Multiple Choice

Based on the experiment in which Drosophila flies were raised at a higher than normal oxygen concentration, which of the following statements is most likely true?

• A) Fly body size is constrained because there are not enough alleles that increase body size.
• B) Fly body size is constrained because alleles that increase body size are selected against at normal oxygen levels.
• C) At normal oxygen concentration levels, fly body size is under strong directional selection.
• D) Fly body size would likely increase if flies were raised at lower than normal oxygen concentrations.
• E) Increased oxygen levels appear to have little effect on fly body size, even after many generations.

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