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Cambridge IGCSE Biology practice

Paper 4 structured question: Chromosomes, genes and proteins

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Chromosomes, genes and proteins

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Paper 4Theory (Extended)2 marks

Chromosome numbers in reproductive cells

Description

Haploid Nuclei in Gametes

Gametes such as sperm and egg cells have haploid nuclei to ensure the correct chromosome number after fertilization.

  1. a

    Describe why gametes have haploid nuclei.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: Chromosomes, genes and proteins

Paper 4Theory (Extended)1 marks

Description

Haploid and Diploid Nuclei

Cells can have different numbers of chromosome sets in their nuclei. Haploid nuclei have one set of chromosomes, while diploid nuclei have two sets.

  1. a

    State what is meant by a haploid nucleus?

    Aim for approximately 1 distinct marking point.

    [1]