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Chapter 6 Practice Paper: Inheritance — question paper

QuizQuipPractice Series
QQ/S4CBI/CH6

Secondary 4 · Combined Science (Biology) (G2 / G3)

Chapter 6 Practice Paper

Inheritance

Duration: 40 minutes
Total: 30 marks
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Class:
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Date:

READ THESE INSTRUCTIONS FIRST

  • Answer all questions.
  • Section A: choose the one correct answer for each multiple-choice question.
  • Section B: answer in the spaces provided; show all necessary working.
  • Give numerical answers to 3 significant figures where appropriate, with units.
  • Biological drawings are not required; describe or label structures in words where asked.
  • The use of a calculator is permitted.

Original practice material written for the MOE Combined Science (Biology) syllabus. It is not an official MOE or school examination paper. Chapter 6 (gene vs allele; variation; genetic terms; 3:1 and 1:1 monohybrid crosses; sex determination; mutation).

For Examiner’s Use
Section A/ 10
Section B/ 20
Total/ 30

Section A: Multiple-choice questions[10 marks]

Choose the one correct answer for each question.

  1. 1

    Different forms of the same gene are called

    1. Agenotypes
    2. Balleles
    3. Cphenotypes
    4. Dzygotes
    ( )
  2. 2

    An organism with two identical alleles is

    1. Aheterozygous
    2. Ba hybrid
    3. Chomozygous
    4. Dmutated
    ( )
  3. 3

    Hand span, which can take any value, is an example of

    1. Adiscontinuous variation
    2. Bcontinuous variation
    3. Cmutation
    4. Da sex-linked trait
    ( )
  4. 4

    A cross of Tt × tt gives what fraction of offspring showing the recessive phenotype?

    1. Aall of them
    2. B3/4
    3. C1/2
    4. Dnone
    ( )
  5. 5

    Sickle cell anaemia is caused by

    1. Aan extra chromosome
    2. Bloss of the Y chromosome
    3. Ca bacterial infection
    4. Da change in the haemoglobin gene
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

  1. 1

    Six genetic terms anchor this topic.

    1. (a)

      Explain the terms dominant and recessive.

      [2]
    2. (b)

      Explain the terms homozygous and heterozygous.

      [2]
    3. (c)

      Distinguish genotype from phenotype, with one example pair.

      [2]
  2. 2

    Two heterozygous purple-flowered plants (Pp) are crossed. Purple is dominant over white.

    1. (a)

      Draw a genetic diagram: parents, gametes, offspring genotypes.

      [4]
    2. (b)

      State the genotype and phenotype ratios.

      [2]
    3. (c)

      The F1 plants self-pollinate to give the F2. State which generation the parents in (a) represent and define F2.

      [2]
  3. 3

    A couple have five children: four girls and one boy.

    1. (a)

      Explain, using XX and XY, why each pregnancy has a 50% chance of a boy.

      [3]
    2. (b)

      Explain why four girls and one boy does not disprove the 50% expectation.

      [3]

— End of paper —