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.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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3.Which of the following correctly lists Mendel's three laws of inheritance?
- A.Law of Segregation, Law of Independent Assortment, Law of Dominance
- B.Law of Segregation, Law of Genetic Linkage, Law of Recessiveness
- C.Law of Allele Separation, Law of Independent Assortment, Law of Codominance
- D.Law of Gamete Formation, Law of Trait Inheritance, Law of Dominant Expression
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4.Why are X-linked recessive diseases more common in males?
- A.Males have two X chromosomes
- B.Males have one X chromosome and the Y chromosome cannot mask the abnormal gene
- C.Females do not have X chromosomes
- D.Males are more exposed to genetic mutations
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5.Why does generally only the male child suffer from colour blindness and not the female?
- A.Colour blindness is a sex-linked recessive trait carried on the X chromosome, and males have only one X chromosome.
- B.Colour blindness is caused by a dominant allele on the Y chromosome, which only males possess.
- C.Females have two Y chromosomes, which protect them from colour blindness.
- D.Males inherit colour blindness from their fathers, who pass the disorder directly to sons.
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