Directional selection results in

  1. two peaks in the distribution
  2. narrower distribution around the same mean
  3. a shift in the mean phenotype
  4. no change
Answer

C) a shift in the mean phenotype

One extreme is favoured. AS & A Level Biology · Topic 17 Selection and Evolution · 17.2 Natural and artificial selection

Biology MCQ · More A Level Biology: Selection and evolution MCQs · Practise