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Cambridge IGCSE Biology practice

Paper 4 structured question: Mitosis

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Mitosis

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Paper 4Theory (Extended)3 marks

Chromosome duplication is a key step before mitosis to ensure genetic stability.

Diagram Description

Cell Cycle Phases

The cell cycle includes G1, S, G2, and mitosis phases. Chromosome duplication occurs in one of these phases before mitosis.

PhaseDescription
G1Cell growth
SDNA replication (chromosome duplication)
G2Preparation for mitosis
MitosisCell division
  1. a

    State in which phase chromosomes are duplicated before mitosis.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify why chromosomes must be duplicated before mitosis.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Mitosis

Paper 4Theory (Extended)3 marks

Description

Chromosome Duplication

Before mitosis, chromosomes are duplicated to form sister chromatids joined at the centromere. This process is crucial for cell division.

  1. a

    State what sister chromatids are.

    Aim for approximately 1 distinct marking point.

    [1]
  2. b

    Identify the importance of precise chromosome duplication before mitosis.

    Aim for approximately 2 distinct marking points.

    [2]