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HomeCXC CSEC BiologyCodominance, Incomplete Dominance and Multiple Alleles
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Codominance, Incomplete Dominance and Multiple Alleles
Practice Questions

20 CXC CSEC Biology questions on Codominance, Incomplete Dominance and Multiple Alleles, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Codominance, Incomplete Dominance and Multiple Alleles

Question 1 · 1 mark · Difficulty 1/3

A farmer in Jamaica crossed red-flowered anthurium plants with white-flowered anthurium plants. All the F1 offspring produced pink flowers. This is an example of which pattern of inheritance?

  1. Complete dominance
  2. Incomplete dominance
  3. Codominance
  4. Multiple alleles
Show answer & explanation
✓ Answer: BIncomplete dominance
Award 1 mark for identifying incomplete dominance. In incomplete dominance, neither allele is fully dominant, resulting in a blended phenotype (pink) in the heterozygote. A is incorrect because complete dominance would produce only red or white flowers, not pink. C is incorrect because codominance shows both traits expressed simultaneously, not blended. D is incorrect because multiple alleles involve more than two alleles in a population, not the blending of two parental phenotypes.
Question 2 · 1 mark · Difficulty 1/3

A medical laboratory technician in Kingston tests a blood sample and determines it is type O. What is the genotype of this individual?

  1. IAIB
  2. IAi
  3. IBi
  4. ii
Show answer & explanation
✓ Answer: Dii
Award 1 mark for identifying the correct genotype. Blood type O occurs only when an individual is homozygous recessive (ii), possessing no A or B antigens. A is incorrect because IAIB produces type AB. B and C are incorrect because IAi produces type A and IBi produces type B, respectively.
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CXC CSEC Biology: Codominance, Incomplete Dominance and Multiple Alleles FAQ

How many CXC CSEC Biology questions on Codominance, Incomplete Dominance and Multiple Alleles are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Codominance, Incomplete Dominance and Multiple Alleles 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 Codominance, Incomplete Dominance and Multiple Alleles 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 Codominance, Incomplete Dominance and Multiple Alleles 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 Codominance, Incomplete Dominance and Multiple Alleles typically tested on CXC CSEC Biology papers?
Codominance, Incomplete Dominance and Multiple Alleles 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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