The founder effect occurs when

  1. selection favours the mean
  2. a small group starts a new population with unrepresentative allele frequencies
  3. mutations are frequent
  4. a population suddenly grows
Answer

B) a small group starts a new population with unrepresentative allele frequencies

Few founders carry a sample of alleles. 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