Kramizo
Log inSign up free
HomeCXC CSEC BiologyGenetics and Variation
CXC · CSEC · Biology

Genetics and Variation
Practice Questions

80 CXC CSEC Biology questions on Genetics and Variation, each with instant feedback and a full examiner-style mark scheme.

⚡ Start Quiz on Genetics and Variation📖 Read Revision NotesTry one question
✨ 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: BB. 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

A genetics student in Dominica is studying coat colour in rabbits. She crosses a black rabbit (BB) with a brown rabbit (bb). What percentage of the F1 generation will be black?

  1. 25%
  2. 50%
  3. 75%
  4. 100%
Show answer & explanation
✓ Answer: D100%
Award 1 mark for correct prediction. All F1 offspring from BB × bb will be Bb (heterozygous) and will express the dominant black phenotype. A is incorrect because this represents homozygous recessive proportion in F2. B is incorrect because this represents testcross ratios. C is incorrect because this represents dominant phenotype proportion in F2.
⚡ Start a Quiz on Genetics and Variation
20 questions · 25 min · free

CXC CSEC Biology: Genetics and Variation FAQ

How many CXC CSEC Biology questions on Genetics and Variation are there on Kramizo?
Kramizo currently has 80 exam-board-aligned practice questions on Genetics and Variation for CXC CSEC 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 CXC 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 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.

Lock in Genetics and Variation before exam day.

Start practising in 30 seconds — no card required.

⚡ Start Quiz Free →