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Edexcel · GCSE · Biology

Genetics
Practice Questions

16 Edexcel GCSE Biology questions on Genetics, 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 Genetics.

Try 2 sample questions on Genetics

Question 1 · 1 mark · Difficulty 1/3

What is a recessive allele?

  1. An allele always expressed
  2. An allele only expressed when homozygous (two copies present, e.g. bb)
  3. A harmful allele
  4. A common allele
Show answer & explanation
✓ Answer: B — An allele only expressed when homozygous (two copies present, e.g. bb)
Recessive alleles are masked by dominant alleles in heterozygotes. Example: if B = brown eyes (dominant) and b = blue eyes (recessive), Bb shows brown eyes.
Question 2 · 1 mark · Difficulty 1/3

What are the complementary base pairs in DNA?

  1. A-C and T-G
  2. A-T and C-G
  3. A-G and T-C
  4. A-A and T-T
Show answer & explanation
✓ Answer: B — A-T and C-G
Adenine (A) pairs with Thymine (T). Cytosine (C) pairs with Guanine (G). They are held together by hydrogen bonds.
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20 questions · 25 min · free

Edexcel GCSE Biology: Genetics FAQ

How many Edexcel GCSE Biology questions on Genetics are there on Kramizo?
Kramizo currently has 16 exam-board-aligned practice questions on Genetics for Edexcel 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 Edexcel 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 Edexcel 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 Genetics practice with other Biology topics or even switch to a totally different Edexcel 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 Genetics questions aligned to the official Edexcel GCSE Biology syllabus?
Every question is written against the published Edexcel 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 Edexcel 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 Edexcel.
How is Genetics typically tested on Edexcel GCSE Biology papers?
Genetics appears across multiple question types on real Edexcel 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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