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Genetics and Variation
Practice Questions

212 CXC CSEC Biology questions on Genetics and Variation, 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 and Variation.

Try 2 sample questions on Genetics and Variation

Question 1 · 1 mark · Difficulty 1/3

Which of the following is the best example of discontinuous variation in humans?

  1. A. Height
  2. B. Blood group
  3. C. Body mass
  4. D. Skin colour
Show answer & explanation
✓ Answer: B — B. Blood group
Blood group is discontinuous variation because individuals fall into distinct, separate categories (A, B, AB, or O) with no intermediates. Height, body mass, and skin colour all show a continuous range of values.
Question 2 · 1 mark · Difficulty 1/3

Which scientist is credited with proposing the theory of evolution by natural selection after studying organisms in the Galápagos Islands?

  1. Gregor Mendel
  2. Charles Darwin
  3. Louis Pasteur
  4. Jean-Baptiste Lamarck
Show answer & explanation
✓ Answer: B — Charles Darwin
Award 1 mark for identifying Darwin. A is incorrect — Mendel studied inheritance in pea plants. C is incorrect — Pasteur worked on germ theory and pasteurisation. D is incorrect — Lamarck proposed inheritance of acquired characteristics, a different evolutionary mechanism.
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20 questions · 25 min · free

CXC CSEC Biology: Genetics and Variation FAQ

Is Kramizo free for CXC CSEC 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 and Variation practice with other Biology topics or even switch to a totally different CXC 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 and Variation questions aligned to the official CXC CSEC Biology syllabus?
Every question is written against the published CXC CSEC Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC 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 CXC.
How is Genetics and Variation typically tested on CXC CSEC Biology papers?
Genetics and Variation appears across multiple question types on real CXC CSEC 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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