Learning objective

Recognize that chromosomes are precisely duplicated prior to the onset of mitosis.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

Cambridge IGCSE BiologyInheritanceSupplement content

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Quick explanation

This point belongs to Mitosis, especially Mitosis outcomes.
You need to be able to recognize that chromosomes are precisely duplicated prior to the onset of mitosis.
The key ideas to know are State.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

State

Why it matters

This objective helps connect Mitosis outcomes to exam-style questions, flashcards, and revision notes for Mitosis.

Revision tools

Flashcards10 linked cards

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Practice Questions7 linked questions

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Paper 4Theory (Extended)3 marks

Diagram Description

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

Phase	Description
G1	Cell growth
S	DNA replication (chromosome duplication)
G2	Preparation for mitosis
Mitosis	Cell division

a
State in which phase chromosomes are duplicated before mitosis.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify why chromosomes must be duplicated before mitosis.
Your answer
Aim for approximately 2 distinct marking points.
[2]

Revision notestopic notes

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