Define the term 'gene' and explain how genes are organised within a cell.

Eduqas GCSE Biology — 2.3.1 DNA structure · Define and Explain · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Model answer (4 marks)

A gene is a section of DNA that codes for a specific protein.
Genes are organised on chromosomes, which are found in the nucleus of the cell.

Examiner tips

  • Use the exact definition of a gene; mention DNA and protein. Explain location: chromosomes in the nucleus. Keep answer concise to match 4 marks.

Common mistakes

  • Writing ‘gene is a sequence of DNA that codes for a trait’ instead of a protein. Forgetting to mention chromosomes or the nucleus. Using vague terms like ‘gene is a part of DNA’ without the protein link.

Mark scheme (4 marks)

  1. A gene is a section / sequence of DNA
  2. that codes for / controls the production of a specific protein
  3. Genes are located on chromosomes
  4. Chromosomes are found in the nucleus of the cell

Key terms in this question

gene

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