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HomeCXC CSEC Integrated ScienceGenetics: Sex Determination and Sex-Linked Inheritance
CXC · CSEC · Integrated Science

Genetics: Sex Determination and Sex-Linked Inheritance
Practice Questions

20 CXC CSEC Integrated Science questions on Genetics: Sex Determination and Sex-Linked Inheritance, 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: Sex Determination and Sex-Linked Inheritance.

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Question 1 · 1 mark · Difficulty 1/3

In humans, which chromosome combination determines that an individual will develop as male?

  1. XX
  2. XY
  3. YY
  4. XO
Show answer & explanation
✓ Answer: BXY
Award 1 mark for identifying XY as the male chromosome combination. A (XX) is incorrect — this is the female chromosome combination. C (YY) is incorrect — this combination is not viable as the X chromosome carries essential genes. D (XO) is incorrect — this represents Turner syndrome, not typical male development.
Question 2 · 1 mark · Difficulty 1/3

Which of the following is an example of a sex-linked trait in humans?

  1. Sickle cell anaemia
  2. Cystic fibrosis
  3. Haemophilia
  4. Albinism
Show answer & explanation
✓ Answer: CHaemophilia
Award 1 mark for identifying haemophilia as X-linked. A (sickle cell anaemia) is incorrect — this is autosomal recessive, common in Caribbean populations but not sex-linked. B (cystic fibrosis) is incorrect — this is autosomal recessive. D (albinism) is incorrect — this is also autosomal recessive.
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CXC CSEC Integrated Science: Genetics: Sex Determination and Sex-Linked Inheritance FAQ

How many CXC CSEC Integrated Science questions on Genetics: Sex Determination and Sex-Linked Inheritance are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Genetics: Sex Determination and Sex-Linked Inheritance 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: Sex Determination and Sex-Linked Inheritance 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: Sex Determination and Sex-Linked Inheritance 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: Sex Determination and Sex-Linked Inheritance typically tested on CXC CSEC Integrated Science papers?
Genetics: Sex Determination and Sex-Linked Inheritance 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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