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Learning objective

Explain how fertilisation restores the full number of chromosomes.

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Topic

Reproduction

Subtopic

Meiosis

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

Explain how fertilisation restores the full number of chromosomes

  • This point belongs to Reproduction, especially Meiosis.
  • You need to be able to explain how fertilisation restores the full number of chromosomes.
  • The key ideas to know are chromosomes and fertilisation.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

chromosomesfertilisation

Why it matters

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

Quick student answer

How do you explain fertilisation restores the full number of chromosomes?

Direct answer

In Biology, this page helps you answer questions about fertilisation restores the full number of chromosomes within Reproduction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are fertilisation and chromosomes.

Key terms

  • fertilisation: The process by which a sperm cell and an egg cell unite to form a zygote, restoring the diploid number of chromosomes.
  • chromosomes: Thread‑like structures within the nucleus that carry genetic material; in fertilisation the combined set from both gametes restores the full chromosome complement.

Common trap

Assuming fertilisation adds chromosomes: Explain that each gamete already contains half the chromosome number; fertilisation joins one haploid set from the sperm with one from the egg to restore the diploid number, not add a full set to an existing diploid cell.

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Question 1

Which option best matches the approved learning objective for Meiosis (1)?

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