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.What happens when a male has an abnormal gene on his X chromosome?
- A.The Y chromosome masks it
- B.The disease occurs because there is no gene on the Y chromosome to mask it
- C.The abnormal gene is repaired by the body
- D.The gene causes no effect in males
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2.What is the significance of variation in a species?
- A.It decreases chances of survival
- B.It helps in creating identical organisms
- C.It increases the chances of survival in a changing environment
- D.It has no role in survival
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3.A family has a history of colour blindness. During a genetic testing, it was found that the mother is a carrier of colour blindness (XᶜX) and the father has normal vision (XY). What is the probability of their sons being colour blind?
- a.25%
- b.50%
- c.75%
- d.0%
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4.There is a 50-50% chance for getting a male or female child. Which statement justifies this?
- A.Equal probability of X or Y sperm fertilizing the egg
- B.The egg determines the sex of the child
- C.All sperm carry the same sex chromosome
- D.The chance depends on the mother's diet
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5.In a certain species of animals, black fur (B) is dominant over brown fur (b). When both parents are heterozygous (Bb) for black fur, which of the following correctly represents the expected genotype and phenotype of their offspring?
- A.Genotypes: 1 BB : 1 Bb : 1 bb; Phenotypes: 2 Black : 2 Brown
- B.Genotypes: 1 BB : 2 Bb : 1 bb; Phenotypes: 3 Black : 1 Brown
- C.Genotypes: 2 BB : 1 Bb : 1 bb; Phenotypes: 3 Black : 1 Brown
- D.Genotypes: 1 BB : 1 Bb : 2 bb; Phenotypes: 1 Black : 3 Brown
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