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HomeCXC CSEC Integrated ScienceGenetics: Monohybrid Crosses and Probability
CXC · CSEC · Integrated Science

Genetics: Monohybrid Crosses and Probability
Practice Questions

20 CXC CSEC Integrated Science questions on Genetics: Monohybrid Crosses and Probability, 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: Monohybrid Crosses and Probability.

Try 2 sample questions on Genetics: Monohybrid Crosses and Probability

Question 1 · 1 mark · Difficulty 1/3

Which of the following correctly describes the term 'allele'?

  1. The physical appearance of an organism
  2. Alternative forms of the same gene
  3. A pair of chromosomes from each parent
  4. The complete set of genes in an organism
Show answer & explanation
✓ Answer: BAlternative forms of the same gene
Award 1 mark for correct definition. A is incorrect — this describes phenotype. C is incorrect — this describes homologous chromosomes. D is incorrect — this describes the genome.
Question 2 · 1 mark · Difficulty 1/3

A farmer in Jamaica crosses a pure-breeding tall pigeon pea plant (TT) with a pure-breeding short pigeon pea plant (tt). What is the expected phenotype ratio of the F1 offspring?

  1. All tall
  2. All short
  3. 3 tall : 1 short
  4. 1 tall : 1 short
Show answer & explanation
✓ Answer: AAll tall
Award 1 mark for recognising that when a homozygous dominant (TT) is crossed with a homozygous recessive (tt), all F1 offspring are heterozygous (Tt) and show the dominant phenotype. B is incorrect — short is the recessive trait and would not appear in F1. C is incorrect — this ratio appears in the F2 generation, not F1. D is incorrect — this ratio occurs in a test cross, not this monohybrid cross.
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CXC CSEC Integrated Science: Genetics: Monohybrid Crosses and Probability FAQ

How many CXC CSEC Integrated Science questions on Genetics: Monohybrid Crosses and Probability are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Genetics: Monohybrid Crosses and Probability 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: Monohybrid Crosses and Probability 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: Monohybrid Crosses and Probability 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: Monohybrid Crosses and Probability typically tested on CXC CSEC Integrated Science papers?
Genetics: Monohybrid Crosses and Probability 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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