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HomeCXC CSEC Integrated ScienceGenetics: Inheritance, Variation and Genetic Terms
CXC · CSEC · Integrated Science

Genetics: Inheritance, Variation and Genetic Terms
Practice Questions

20 CXC CSEC Integrated Science questions on Genetics: Inheritance, Variation and Genetic Terms, 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: Inheritance, Variation and Genetic Terms.

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Question 1 · 1 mark · Difficulty 1/3

A farmer in Jamaica is crossing two heterozygous tall pea plants (Tt × Tt). What is the expected ratio of tall to short plants in the offspring?

  1. 1:1
  2. 2:1
  3. 3:1
  4. 4:0
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✓ Answer: C3:1
Award 1 mark for identifying the correct phenotypic ratio from a monohybrid cross between two heterozygous parents. The Punnett square gives TT, Tt, Tt, tt — three tall (TT, Tt, Tt) to one short (tt). A is incorrect — this ratio occurs when crossing Tt × tt. B is incorrect — this is not a standard Mendelian ratio. D is incorrect — this would occur only if both parents were homozygous dominant (TT × TT).
Question 2 · 1 mark · Difficulty 1/3

Which of the following is an example of continuous variation in humans?

  1. Blood group
  2. Attached or free earlobes
  3. Height
  4. Ability to roll the tongue
Show answer & explanation
✓ Answer: CHeight
Award 1 mark for identifying continuous variation — characteristics that show a range of values with no distinct categories. Height is controlled by multiple genes and environmental factors. A is incorrect — blood groups are discrete categories (discontinuous). B is incorrect — earlobes are either attached or free (discontinuous). D is incorrect — tongue rolling is either present or absent (discontinuous).
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CXC CSEC Integrated Science: Genetics: Inheritance, Variation and Genetic Terms FAQ

How many CXC CSEC Integrated Science questions on Genetics: Inheritance, Variation and Genetic Terms are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Genetics: Inheritance, Variation and Genetic Terms for CXC CSEC Integrated Science, 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 Integrated Science?
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: Inheritance, Variation and Genetic Terms practice with other Integrated Science 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: Inheritance, Variation and Genetic Terms questions aligned to the official CXC CSEC Integrated Science syllabus?
Every question is written against the published CXC CSEC Integrated Science 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: Inheritance, Variation and Genetic Terms typically tested on CXC CSEC Integrated Science papers?
Genetics: Inheritance, Variation and Genetic Terms appears across multiple question types on real CXC CSEC Integrated Science 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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