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.(viii) A family has a history of colour blindness. During a genetic testing, it was found that the mother is a carrier of colour blindness (X²X) 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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2.Why did Mendel choose garden pea (Pisum sativum) for his experiments?
- A.They were easy to grow
- B.They had many varieties with contrasting characters
- C.They had a long reproductive span
- D.They were available in pure forms
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3.Explain the following terms: (i) Law of Dominance:
- A.Out of a pair of contrasting alleles present together, only the recessive allele is able to express itself while the dominant remains suppressed.
- B.Out of a pair of contrasting alleles present together, only the dominant allele is able to express itself while the recessive remains suppressed.
- C.Out of a pair of contrasting alleles present together, both the dominant and recessive cannot express themselves.
- D.Out of a pair of contrasting alleles present together, both the dominant and recessive can express themselves.
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4.The condition in which a pair of chromosomes carry similar alleles of a particular character is called:
- A.Homozygous
- B.Heterozygous
- C.Hemizygous
- D.Polyploid
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5.Work out the progeny in the following Punnett square for a marriage between a carrier woman (XX°) and a colour-blind man (X°Y). Which labelled cell in the diagram (img-15.jpeg) represents the genotype of a colour-blind daughter?
- A.The cell showing XX°
- B.The cell showing X°X°
- C.The cell showing XY
- D.The cell showing X°Y
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