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A Level Biology: Selection and evolution MCQs — Biology (page 2)

29 multiple-choice questions on A Level Biology: Selection and evolution from Biology, each with the correct answer and, where available, a teacher's explanation. Read through them to revise the chapter, then practise the same questions one by one to test yourself.

26. A population bottleneck results in

  1. no change in allele frequencies
  2. reduced genetic diversity
  3. increased genetic diversity
  4. new species immediately

Answer: B) reduced genetic diversity

Explanation: Few survivors carry few alleles. AS & A Level Biology · Topic 17 Selection and Evolution · 17.2 Natural and artificial selection

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27. Which condition is required for the Hardy–Weinberg principle to apply?

  1. No migration
  2. Small population
  3. Non-random mating
  4. Strong natural selection

Answer: A) No migration

Explanation: Large, random mating, no mutation, migration or selection. AS & A Level Biology · Topic 17 Selection and Evolution · 17.2 Natural and artificial selection

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28. Allopatric speciation occurs when populations are separated by

  1. polyploidy only
  2. behavioural differences in the same area
  3. different diets in the same area
  4. a geographical barrier

Answer: D) a geographical barrier

Explanation: Allo = other place. AS & A Level Biology · Topic 17 Selection and Evolution · 17.3 Evolution

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29. An example of variation caused by both genes and environment is

  1. human height
  2. sickle cell anaemia
  3. blood group
  4. albinism

Answer: A) human height

Explanation: Genes set potential; diet affects outcome. AS & A Level Biology · Topic 17 Selection and Evolution · 17.1 Variation

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