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Learning objective

Distinguish genes, alleles, chromosomes, genome and proteome.

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Topic

Genetic information official content

Subtopic

DNA, genes and chromosomes

Aqa A Level BiologyGenetic information, variation and relationships between organisms

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Quick explanation

Distinguish genes, alleles, chromosomes, genome and proteome

  • This point belongs to Genetic information official content, especially DNA, genes and chromosomes.
  • You need to be able to distinguish genes, alleles, chromosomes, genome and proteome.
  • The key ideas to know are gene, genome, and chromosome.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

genegenomechromosomealleleproteome

Why it matters

This objective helps connect DNA, genes and chromosomes to exam-style questions, flashcards, and revision notes for Genetic information official content.

Quick student answer

Which of the following correctly defines a gene?

Direct answer

A segment of DNA that codes for a protein

Key terms

  • Chromosome: A structure composed of DNA and proteins that carries genetic information.
  • Proteome: The entire set of proteins that can be expressed by the genetic material of an organism.

Common trap

Confusing genes with alleles: Remember that a gene is a segment of DNA, while an allele is a specific variant of that gene.

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