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ISC Class 12 Genetics and Evolution — practice questions

Explore 109 free Genetics and Evolution questions in ISC Class 12 Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Genetics and Evolution questions and exercises with answers

Showing questions 1–30 of 109.

NEET · Bio · Principles of Inheritance · Codominance vs Incomplete DominanceRead the answer and worked solution →NEETUG · Biology · Spot the Error — GeneticsRead the answer and worked solution →A cross between true-breeding red (RR) and true-breeding white (rr) snapdragons gives pink F₁ plants. This pattern is best described asRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Mendelian Term — TypingRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Polygenic — Gap FillRead the answer and worked solution →NEET · Biology · True or False — GeneticsRead the answer and worked solution →Morgan's discovery of linkage in Drosophila showed thatRead the answer and worked solution →In honey bees, drones (male bees) develop fromRead the answer and worked solution →Haemophilia and colour blindness are inherited asRead the answer and worked solution →In a monohybrid cross of Tt × Tt, the F2 PHENOTYPIC ratio is:Read the answer and worked solution →Down syndrome is most commonly caused by:Read the answer and worked solution →NEET · Bio · Principles of Inheritance · X-linked or Autosomal DisorderRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Tap Sex-Linked DisordersRead the answer and worked solution →Mendel's Law of Independent Assortment is best illustrated by the F₂ ratioRead the answer and worked solution →The Hershey-Chase experiment used radioactive isotopes to labelRead the answer and worked solution →Pop only the nitrogen bases found in DNA.Read the answer and worked solution →DNA polymerase synthesises a new DNA strand in which direction?Read the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Chargaff's Rule — Gap FillRead the answer and worked solution →The START codon in eukaryotic mRNA translation is:Read the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · DNA Base PairingRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Codon → Amino AcidRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Term — TypingRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · DNA or RNARead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Replication EnzymeRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Tap Purines OnlyRead the answer and worked solution →NEET · Bio · Principles of Inheritance · Tap Genetic Disorders (Autosomal)Read the answer and worked solution →Order the flow of genetic informationRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Central Dogma — TraceRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Mutation TypeRead the answer and worked solution →NEET · Biology · Molecular Basis of Inheritance · Experiment to DiscoveryRead the answer and worked solution →

Worked practice questions

NEET · Bio · Principles of Inheritance · Codominance vs Incomplete Dominance

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Items
  1. Item
    Human ABO blood (AB type)
    Answer
    left
  2. Item
    Snapdragon pink F1
    Answer
    right
  3. Item
    Roan cattle coat (red+white)
    Answer
    left
  4. Item
    Mirabilis jalapa pink F1
    Answer
    right
  5. Item
    Sickle-cell trait (both Hb expressed)
    Answer
    left
  6. Item
    Andalusian blue chicken F1
    Answer
    right
Categories
Left
Codominance
Right
Incomplete dominance
Instructions
Sort each example: codominance or incomplete dominance.

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NEETUG · Biology · Spot the Error — Genetics

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Questions
  1. Statement parts
    1. Mendel
    2. worked
    3. with
    4. Drosophila
    5. for
    6. his
    7. experiments
    8. .
    Correction
    pea plants
    Incorrect part
    Drosophila
  2. Statement parts
    1. A
    2. gene
    3. that
    4. masks
    5. another
    6. is
    7. called
    8. recessive
    9. .
    Correction
    dominant
    Incorrect part
    recessive
  3. Statement parts
    1. Two
    2. alleles
    3. that
    4. are
    5. identical
    6. make
    7. the
    8. individual
    9. heterozygous
    10. .
    Correction
    homozygous
    Incorrect part
    heterozygous
  4. Statement parts
    1. Sex
    2. in
    3. humans
    4. is
    5. determined
    6. by
    7. the
    8. Y
    9. chromosome
    10. alone
    11. .
    Correction
    X and Y
    Incorrect part
    alone
Instructions
One word is wrong in each line — tap it.

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A cross between true-breeding red (RR) and true-breeding white (rr) snapdragons gives pink F₁ plants. This pattern is best described as

  1. incomplete dominance
  2. complete dominance
  3. co-dominance
  4. epistasis
Show answer and solution

Correct answer: A. incomplete dominance

The heterozygote Rr shows a phenotype (pink) intermediate between the two parental colours, indicating that neither allele completely masks the other. This is incomplete dominance.

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