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

Inheritance: dominant, recessive and codominant alleles
Practice Questions

19 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.

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Question 1 · 1 mark · Difficulty 1/3

What is an allele?

  1. A different version of a gene
  2. A section of DNA that codes for a protein
  3. The complete set of genetic information in an organism
  4. A pair of chromosomes found in body cells
Show answer & explanation
✓ Answer: AA 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 2/3

In pea plants, tall (T) is dominant over dwarf (t). Two heterozygous tall plants are crossed. What proportion of the offspring are predicted to be dwarf?

  1. 1/4
  2. 1/2
  3. 3/4
  4. 0
Show answer & explanation
✓ Answer: A1/4
A cross between two heterozygous plants (Tt × Tt) gives genotype ratios TT : Tt : tt = 1 : 2 : 1. Only tt offspring are dwarf, giving a 1 in 4 (1/4) probability. Students often confuse the 3:1 phenotype ratio with the 1:2:1 genotype ratio.
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AQA GCSE Biology: Inheritance: dominant, recessive and codominant alleles FAQ

How many AQA GCSE Biology questions on Inheritance: dominant, recessive and codominant alleles are there on Kramizo?
Kramizo currently has 19 exam-board-aligned practice questions on Inheritance: dominant, recessive and codominant alleles for AQA GCSE Biology, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real AQA paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for AQA GCSE students preparing for Biology?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Inheritance: dominant, recessive and codominant alleles practice with other Biology topics or even switch to a totally different AQA subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
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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