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Learning objective

State that 22 chromosome pairs control characteristics only and one pair determines sex.

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Topic

Reproduction

Subtopic

Sex determination

Aqa Gcse BiologyInheritance, variation and evolution

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Quick explanation

State that 22 chromosome pairs control characteristics only and one pair determines sex

  • This point belongs to Reproduction, especially Sex determination.
  • You need to be able to state that 22 chromosome pairs control characteristics only and one pair determines sex.
  • The key ideas to know are chromosome pairs.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

chromosome pairs

Why it matters

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

Quick student answer

What should you know about 22 chromosome pairs control characteristics only and one pair determines sex?

Direct answer

In Biology, this page helps you answer questions about 22 chromosome pairs control characteristics only and one pair determines sex within Reproduction. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are chromosome pairs and sex determination.

Key terms

  • chromosome pairs: Pairs of chromosomes that contain genes controlling various characteristics of an organism.
  • sex determination: The process by which the sex of an organism is established, determined by the presence of specific sex chromosomes.

Common trap

Misunderstanding Chromosome Function: Emphasize that 22 pairs are responsible for traits and characteristics, while only one pair (the sex chromosomes) determines sex.

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