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

35 multiple-choice questions on A 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. For a chi-squared test with four phenotype classes, the degrees of freedom are

  1. 1
  2. 4
  3. 2
  4. 3

Answer: D) 3

Explanation: Classes − 1. AS & A Level Biology · Topic 16 Inheritance · 16.2 The roles of genes in determining the phenotype

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27. In anaphase II,

  1. crossing over occurs
  2. sister chromatids separate
  3. homologous chromosomes separate
  4. bivalents form

Answer: B) sister chromatids separate

Explanation: Centromeres divide in anaphase II. AS & A Level Biology · Topic 16 Inheritance · 16.1 Passage of information from parents to offspring

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28. Meiosis is needed to form gametes because

  1. it halves the chromosome number so the diploid number is restored at fertilisation
  2. it doubles chromosome number
  3. it repairs tissues
  4. it produces identical cells

Answer: A) it halves the chromosome number so the diploid number is restored at fertilisation

Explanation: Reduction division. AS & A Level Biology · Topic 16 Inheritance · 16.1 Passage of information from parents to offspring

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29. Bivalents line up on the equator during

  1. metaphase II
  2. anaphase II
  3. metaphase I
  4. prophase II

Answer: C) metaphase I

Explanation: Pairs line up in metaphase I. AS & A Level Biology · Topic 16 Inheritance · 16.1 Passage of information from parents to offspring

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30. Independent assortment results from

  1. crossing over
  2. random fertilisation
  3. random orientation of homologous pairs on the equator in metaphase I
  4. mitosis

Answer: C) random orientation of homologous pairs on the equator in metaphase I

Explanation: Bivalents line up randomly. AS & A Level Biology · Topic 16 Inheritance · 16.1 Passage of information from parents to offspring

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31. Gibberellin promotes transcription of amylase genes by

  1. inhibiting transcription factors
  2. causing DELLA proteins to be broken down
  3. binding directly to the amylase gene
  4. activating the lac operon

Answer: B) causing DELLA proteins to be broken down

Explanation: Removing the repressor frees the transcription factor. AS & A Level Biology · Topic 16 Inheritance · 16.3 Gene control

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32. A locus is

  1. a type of chromosome
  2. an alternative form of a gene
  3. a pair of alleles
  4. the position of a gene on a chromosome

Answer: D) the position of a gene on a chromosome

Explanation: Definition of locus. AS & A Level Biology · Topic 16 Inheritance · 16.2 The roles of genes in determining the phenotype

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33. Codominance in flowers (red × white → all pink) means the F2 ratio is

  1. 1 red : 2 pink : 1 white
  2. all pink
  3. 9 : 3 : 3 : 1
  4. 3 red : 1 white

Answer: A) 1 red : 2 pink : 1 white

Explanation: Each genotype has its own phenotype. AS & A Level Biology · Topic 16 Inheritance · 16.2 The roles of genes in determining the phenotype

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34. A human cell has 2n = 46. How many chromosomes are in each cell at the end of meiosis II?

  1. 12
  2. 46
  3. 92
  4. 23

Answer: D) 23

Explanation: Haploid number. AS & A Level Biology · Topic 16 Inheritance · 16.1 Passage of information from parents to offspring

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35. The expected ratio from a dihybrid cross between two double heterozygotes (unlinked genes) is

  1. 9 : 3 : 3 : 1
  2. 3 : 1
  3. 1 : 1 : 1 : 1
  4. 1 : 2 : 1

Answer: A) 9 : 3 : 3 : 1

Explanation: AaBb × AaBb. AS & A Level Biology · Topic 16 Inheritance · 16.2 The roles of genes in determining the phenotype

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