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HomeCXC CSEC BiologyMendelian Genetics: Monohybrid Inheritance
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Mendelian Genetics: Monohybrid Inheritance
Practice Questions

20 CXC CSEC Biology questions on Mendelian Genetics: Monohybrid 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 Mendelian Genetics: Monohybrid Inheritance.

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Question 1 · 1 mark · Difficulty 1/3

A genetics student in Dominica is studying coat colour in rabbits. She crosses a black rabbit (BB) with a brown rabbit (bb). What percentage of the F1 generation will be black?

  1. 25%
  2. 50%
  3. 75%
  4. 100%
Show answer & explanation
✓ Answer: D100%
Award 1 mark for correct prediction. All F1 offspring from BB × bb will be Bb (heterozygous) and will express the dominant black phenotype. A is incorrect because this represents homozygous recessive proportion in F2. B is incorrect because this represents testcross ratios. C is incorrect because this represents dominant phenotype proportion in F2.
Question 2 · 1 mark · Difficulty 1/3

A farmer in Clarendon, Jamaica, crosses two corn plants that are both heterozygous for yellow seeds (Yy). Yellow is dominant to white. What is the expected phenotypic ratio in the offspring?

  1. 3 yellow : 1 white
  2. 1 yellow : 1 white
  3. All yellow
  4. 2 yellow : 2 white
Show answer & explanation
✓ Answer: A3 yellow : 1 white
Award 1 mark for recognizing the classic monohybrid cross phenotypic ratio. When two heterozygous individuals (Yy × Yy) are crossed, the offspring ratio is 3 dominant : 1 recessive. B is incorrect because 1:1 ratio occurs only when crossing heterozygous with homozygous recessive. C is incorrect because some offspring will be homozygous recessive (yy). D is incorrect because this is not a Mendelian ratio.
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CXC CSEC Biology: Mendelian Genetics: Monohybrid Inheritance FAQ

How many CXC CSEC Biology questions on Mendelian Genetics: Monohybrid Inheritance are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Mendelian Genetics: Monohybrid Inheritance 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 Mendelian Genetics: Monohybrid Inheritance 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 Mendelian Genetics: Monohybrid Inheritance 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 Mendelian Genetics: Monohybrid Inheritance typically tested on CXC CSEC Biology papers?
Mendelian Genetics: Monohybrid Inheritance 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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