The graphs to the left and right respectively refer to before and after selection. Which type of selection has occurred in this population? Phenotype frequency Trait value (before selection) Phenotype frequency Trait value (after selection) A. directional B. disruptive (or diversifying) C. stabilizing D. frequency-dependent
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Stabilizing selection differs from directional selection because a. in the former, phenotypic variation is reduced but the average phenotype stays the same, whereas in the latter both the variation and the mean phenotype change. b. the former requires genetic variation, but the latter does not. c. intermediate phenotypes are favored in directional selection. d. None of the choices is correct.
The distribution of phenotypes shown in the figure is most consistent with (a) no selection (b) stabilizing selection (c) directional selection (d) disruptive selection (e) genetic equilibrium
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The graph below is of directional selection. Which statement can be supported by the evidence shown in the graph? A Directional selection occurs when phenotypes at both extremes of the phenotypic distribution are selected against. B Directional selection occurs when one of two extreme phenotypes is selected against. C Directional selection occurs when one of two extreme phenotypes is selected for. D Directional selection occurs when phenotypes in the middle of the range are selected against. Directional Selection Original population
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