ICSE Class 10 Genetics — Basic Fundamentals — Mock Test (2027)
Free online mock test for Genetics — Basic Fundamentals (ICSE Class 10 Biology) — 20 competency-based questions based on the latest CISCE 2027 syllabus, with instant marking. Try the samples below, then take the full test free.
What to expect: This mock test covers key concepts from the Genetics — Basic Fundamentals chapter — including application-based and competency-focused questions aligned with how ICSE actually sets the paper.
Tip: Attempt without notes first to identify gaps, then review explanations for any wrong answers. Retake after a few days for best retention.
Sample questions
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1.Which of the following correctly differentiates between phenotype and genotype?
- A.Phenotype is the genetic makeup; genotype is the observable trait.
- B.Phenotype is the observable trait; genotype is the genetic makeup.
- C.Both phenotype and genotype refer to observable traits.
- D.Genotype is the physical appearance; phenotype is the gene set.
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2.What is genetic engineering?
- A.Study of human anatomy
- B.Technique to alter genetic constitution by introducing new genes
- C.Observation of plants in natural habitat
- D.Study of animal behavior
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3.In the case of the twins (one black and one white) born to a mixed-race darkish mother and a white father, the genetic probability leading to this inheritance pattern is illustrated below. Skin colour is determined by 3 genes — A, B, and C. Mother (Darkish):
Two of the several combinations of these genes through the egg and sperm could be as follows:
Darkish (Darker than the mother): 
Which labeled part in the diagram (img-32.jpeg) most likely represents the combination of alleles resulting in the **black twin's** skin color?- A.A section showing all dominant alleles (e.g., AABBCC)
- B.A section showing a mix of dominant and recessive alleles (e.g., AaBbCc)
- C.A section showing mostly recessive alleles (e.g., aaBbcc)
- D.A section showing all recessive alleles (e.g., aabbcc)
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4.What term describes the suppressed alleles of a gene?
- A.Recessive
- B.Dominant
- C.Codominant
- D.Lethal
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5.Which of the following best describes a gene?
- A.A unit of heredity composed of DNA
- B.A type of protein that determines traits
- C.A segment of RNA that codes for lipids
- D.A structure found only in reproductive cells
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