Cambridge IGCSE Biology practice

Paper 4 structured question: Sexual reproduction

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Paper

Marks

Topic

Sexual reproduction

Exam-style question

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Paper 4Theory (Extended)2 marks

Understanding chromosome numbers in reproduction

Description

Gametes are reproductive cells that fuse during fertilization to form a zygote. The number of chromosome sets in their nuclei differs.

a
State the chromosome number in the nucleus of a gamete.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify the chromosome number in the nucleus of a zygote formed by fertilization.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 4Theory (Extended)2 marks

Description

During sexual reproduction, gametes fuse to form a zygote. The chromosome number changes in the nuclei involved.

a
State the ploidy level of gamete nuclei.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
State the ploidy level of the zygote nucleus after fertilization.
Your answer
Aim for approximately 1 distinct marking point.
[1]