Practice question

Question

A researcher studying the effect of urban environment on bird song finds that urban bird song is higher pitched than rural bird song. To test whether this difference has a genetic basis or is due to phenotypic plasticity, she creates four experimental treatments: [Formula] She measures the average pitch of song of adult birds reared from these four treatments and concludes that genetic differences underlie the differences in pitch. Which of the following patterns in the variation in pitch provides evidence for this conclusion? A researcher studying the effect of urban environment on bird song finds that urban bird song is higher pitched than rural bird song. To test whether this difference has a genetic basis or is due to phenotypic plasticity, she creates four experimental treatments: [Formula] She measures the average pitch of song of adult birds reared from these four treatments and concludes that genetic differences underlie the differences in pitch. Which of the following patterns in the variation in pitch provides evidence for this conclusion?