Compare and contrast the three modes of selection we reviewed in Chapter 9, directional selection, stabilizing...
Compare and contrast the three modes of selection we reviewed in Chapter 9, directional selection, stabilizing selection and disruptive selection. You should include the similarities, fitness of the population over time, and impact on genetic variation over time.
Homework Answers
Ans) Directional selection occurs in changing environment and alters the traits mean value in one direction, fitness of poplulation increase over time because extreme phenotypes are favoured and not the average ones.Genetic variations occur due to this overtime.
Disruptive selection is little similar to directional selection but instead of one direction, both the extreme phenotypes are favoured and not one .Here also the mean value of traits is altered and genetic variations will occur overtime.
Stabilizing selection occurs in unchanging environment unlike directional and disruptive selection.In stabilizing selection,normal or average phenotypes are favoured and thus due to this homozygosity will be maintained and there will be no genetic variations unlike observed in Directional and Disruptive selection.Fitness value will not increase (since extreme phenotypes have highest fitness).Mean value of trait is not altered in Stabilizing selection.
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