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O Level Biology: Inheritance MCQs — Biology (page 2)

30 multiple-choice questions on O Level Biology: Inheritance 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. The shape of DNA is a

  1. double helix
  2. circle only
  3. single strand
  4. triple helix

Answer: A) double helix

Explanation: Two strands twisted together. O Level Biology · Topic 17 Inheritance · 17.2 DNA

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27. The development of antibiotic resistance in bacteria is an example of

  1. artificial selection
  2. codominance
  3. genetic modification
  4. natural selection

Answer: D) natural selection

Explanation: Resistant bacteria survive and reproduce. O Level Biology · Topic 17 Inheritance · 17.4 Selection

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28. The observable features of an organism are its

  1. phenotype
  2. genotype
  3. chromosomes
  4. alleles

Answer: A) phenotype

Explanation: Phenotype = appearance. O Level Biology · Topic 17 Inheritance · 17.3 Inheritance

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29. ABO blood groups show

  1. continuous variation
  2. discontinuous variation
  3. environmental variation only
  4. natural selection

Answer: B) discontinuous variation

Explanation: Distinct groups, no intermediates. O Level Biology · Topic 17 Inheritance · 17.1 Variation

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30. Height in humans is an example of

  1. codominance
  2. discontinuous variation
  3. continuous variation
  4. mutation

Answer: C) continuous variation

Explanation: Height shows a range of values. O Level Biology · Topic 17 Inheritance · 17.1 Variation

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