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HomeCXC CSEC Human and Social BiologyHeredity and Variation
CXC · CSEC · Human and Social Biology

Heredity and Variation
Practice Questions

16 CXC CSEC Human and Social Biology questions on Heredity 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 Heredity and Variation.

Try 2 sample questions on Heredity and Variation

Question 1 · 1 mark · Difficulty 1/3

How many chromosomes do human body cells have?

  1. 23
  2. 46
  3. 22
  4. 48
Show answer & explanation
✓ Answer: B46
Human body cells (somatic cells) are diploid with 46 chromosomes (23 pairs). Gametes (sex cells) are haploid with 23 chromosomes.
Question 2 · 1 mark · Difficulty 1/3

What is a gene?

  1. A whole chromosome
  2. A section of DNA that codes for a specific protein or characteristic
  3. A type of cell
  4. An amino acid
Show answer & explanation
✓ Answer: BA section of DNA that codes for a specific protein or characteristic
A gene is a short section of DNA on a chromosome that contains the instructions (code) for making a specific protein, which determines a particular characteristic.
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CXC CSEC Human and Social Biology: Heredity and Variation FAQ

How many CXC CSEC Human and Social Biology questions on Heredity and Variation are there on Kramizo?
Kramizo currently has 16 exam-board-aligned practice questions on Heredity and Variation for CXC CSEC Human and Social 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 Human and Social 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 Heredity and Variation practice with other Human and Social 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 Heredity and Variation questions aligned to the official CXC CSEC Human and Social Biology syllabus?
Every question is written against the published CXC CSEC Human and Social 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 Heredity and Variation typically tested on CXC CSEC Human and Social Biology papers?
Heredity and Variation appears across multiple question types on real CXC CSEC Human and Social 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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