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HomeAQA GCSE BiologyInheritance: dominant, recessive and codominant alleles
AQA · GCSE · Biology

Inheritance: dominant, recessive and codominant alleles
Practice Questions

40 AQA GCSE Biology questions on Inheritance: dominant, recessive and codominant alleles, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for Inheritance: dominant, recessive and codominant alleles.

Try 2 sample questions on Inheritance: dominant, recessive and codominant alleles

Question 1 · 1 mark · Difficulty 1/3

What is an allele?

  1. A pair of chromosomes found in body cells
  2. A different version of a gene
  3. A section of DNA that codes for a protein
  4. The complete set of genetic information in an organism
Show answer & explanation
✓ Answer: BA different version of a gene
An allele is a different version of a gene. For example, the gene for eye colour has alleles for brown eyes and blue eyes. Students often confuse alleles with genes themselves.
Question 2 · 1 mark · Difficulty 1/3

What is meant by the genotype of an organism?

  1. Its physical appearance and characteristics
  2. The species that it belongs to
  3. The combination of alleles it carries for a characteristic
  4. The total number of chromosomes in its cells
Show answer & explanation
✓ Answer: CThe combination of alleles it carries for a characteristic
Award 1 mark. The phenotype is what the organism looks like, and two organisms with different genotypes can share the same phenotype if one of the alleles is dominant.
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AQA GCSE Biology: Inheritance: dominant, recessive and codominant alleles FAQ

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Are the Inheritance: dominant, recessive and codominant alleles questions aligned to the official AQA GCSE Biology syllabus?
Every question is written against the published AQA GCSE Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real AQA paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from AQA.
How is Inheritance: dominant, recessive and codominant alleles typically tested on AQA GCSE Biology papers?
Inheritance: dominant, recessive and codominant alleles appears across multiple question types on real AQA GCSE Biology papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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