Discontinuous variation is usually caused by

  1. the environment only
  2. many genes with small effects
  3. one or a few genes with large effects
  4. polygenes
Answer

C) one or a few genes with large effects

Few genes, distinct classes. AS & A Level Biology · Topic 17 Selection and Evolution · 17.1 Variation

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