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HomeCXC CSEC BiologyMutations – Gene and Chromosomal Mutations
CXC · CSEC · Biology

Mutations – Gene and Chromosomal Mutations
Practice Questions

20 CXC CSEC Biology questions on Mutations – Gene and Chromosomal Mutations, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Mutations – Gene and Chromosomal Mutations

Question 1 · 1 mark · Difficulty 1/3

Which of the following BEST defines a gene mutation?

  1. A change in the number of chromosomes in a cell
  2. A change in the sequence of bases in a DNA molecule
  3. A change in the arrangement of chromosomes during meiosis
  4. A change in the shape of a chromosome during cell division
Show answer & explanation
✓ Answer: BA change in the sequence of bases in a DNA molecule
A gene mutation involves an alteration in the sequence of nucleotide bases within a DNA molecule, which can affect the protein produced. Changes in chromosome number or structure are classified as chromosomal mutations, not gene mutations.
Question 2 · 1 mark · Difficulty 2/3

A section of DNA normally reads: TAC-GGA-CTT. After a mutation, it reads: TAC-GGA-CTT-AAA. Which type of gene mutation has occurred?

  1. Substitution
  2. Deletion
  3. Inversion
  4. Insertion
Show answer & explanation
✓ Answer: DInsertion
An insertion mutation occurs when one or more nucleotide bases are added into the DNA sequence, as shown by the addition of AAA at the end. Substitution replaces one base with another, and deletion removes bases entirely.
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CXC CSEC Biology: Mutations – Gene and Chromosomal Mutations FAQ

How many CXC CSEC Biology questions on Mutations – Gene and Chromosomal Mutations are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Mutations – Gene and Chromosomal Mutations 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 Mutations – Gene and Chromosomal Mutations 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 Mutations – Gene and Chromosomal Mutations 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 Mutations – Gene and Chromosomal Mutations typically tested on CXC CSEC Biology papers?
Mutations – Gene and Chromosomal Mutations 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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