Principles of Inheritance and Variation – CBSE Class 12 Previous Year Questions (2023–2026)

All 12 CBSE Class 12 previous-year questions from Principles of Inheritance and Variation (Biology), 2023–2026, taken from 7 papers. Practise them together in one test with the official marking and answer key, then review every answer.

▶ Practise all 12 questionsAll CBSE Class 12 chapters

Principles of Inheritance and Variation questions by paper

Sample questions

• CBSE Class 12 Biology Board 2026 (Set 57/1/1)
  In the following figure two ways of pairing of two homologous pairs of chromosomes are shown Which of the following phenomena is expressed 1 Possibility 1 Possibility 2…
• CBSE Class 12 Biology SQP 2026-27
  Study the given pedigree and identify the disease represented fy we A Myotonic Dystrophy Sickle cell anaemia Haemophilia Colour blindness
• CBSE Class 12 Biology SQP 2026-27
  Assertion A There is no variation in the percentage recombination due to loosely or tightly linked genes Reason Linked genes result in occurrence of higher proportion…
• CBSE Class 12 Biology Board 2025 (Set 57/1/1)
  A man whose father was colour-blind marries a woman who had a colour blind mother and normal father What percentage of male children of this couple will be colour-blind…

Question text shown from the scanned paper; open the test to see each question exactly as printed.

More Biology chapters

• Sexual Reproduction in Flowering Plants 13
• Human Reproduction 9
• Reproductive Health 5
• Molecular Basis of Inheritance 17
• Evolution 9
• Human Health and Disease 7
• Strategies for Enhancement in Food Production 3
• Microbes in Human Welfare 7
• Biotechnology: Principles and Processes 16
• Biotechnology and its Applications 9
• Organisms and Populations 2
• Ecosystem 4
• Biodiversity and Conservation 2
• Environmental Issues 2