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.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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2.A pair of chromosomes carrying dissimilar alleles for a particular character is called:
- A.Heterozygous
- B.Homozygous
- C.Hemizygous
- D.Polyploid
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3.Genes
- A.Help in carrying gametes
- B.Encode fats and lipids
- C.Encode particular protein
- D.Help in DNA replication
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4.In the context of tongue rolling, which one of the following correctly identifies the homozygous dominant and homozygous recessive genotypes from the given options: Rr, rr, RR?
- A.Homozygous dominant: RR, Homozygous recessive: Rr
- B.Homozygous dominant: RR, Homozygous recessive: rr
- C.Homozygous dominant: Rr, Homozygous recessive: rr
- D.Homozygous dominant: rr, Homozygous recessive: RR
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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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