Principles of Inheritance and Variation
167 CBSE Class 12 Biology past-year questions from 4 papers, 2023 to 2026, with answers and worked solutions.
- Difficulty: 61 easy · 84 moderate · 22 hard.
- Most-asked subtopics: Genetic Disorders (68), Inheritance of One Gene (44), Chromosomal Theory, Linkage and Recombination (16).
- Updated 8 October 2026.
#1Mendel's Laws of Inheritance
#2Mendel's Laws of Inheritance
#3Mendel's Laws of Inheritance
#4Mendel's Laws of Inheritance
#5Mendel's Laws of Inheritance
Done a few? Here’s your next move
#6Inheritance of One Gene
#7Inheritance of One Gene
#8Inheritance of One Gene
#9Inheritance of One Gene
#10Inheritance of One Gene
#11Inheritance of One Gene
#12Inheritance of One Gene
#13Inheritance of One Gene
#14Inheritance of One Gene
#15Inheritance of One Gene
#16Inheritance of One Gene
#17Inheritance of One Gene
#18Inheritance of One Gene
#19Inheritance of One Gene
#20Inheritance of One Gene
#21Inheritance of One Gene
#22Inheritance of One Gene
#23Inheritance of One Gene
#24Inheritance of One Gene
#25Inheritance of One Gene
#26Inheritance of One Gene
#27Inheritance of One Gene
For Questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#28Inheritance of One Gene
For Questions number 13 to 16, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#29Inheritance of One Gene
#30Inheritance of One Gene
#31Inheritance of One Gene
#32Inheritance of One Gene
#33Inheritance of One Gene
For Questions number 13 to 16, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.#34Inheritance of One Gene
#35Inheritance of One Gene
#36Inheritance of One Gene
#37Inheritance of One Gene
#38Inheritance of One Gene
#39Inheritance of One Gene
#40Inheritance of One Gene
#41Inheritance of One Gene
#42Inheritance of One Gene
#43Inheritance of One Gene
#44Inheritance of One Gene
#45Inheritance of One Gene
#46Inheritance of One Gene
A student performed some crosses in plants and represented the result in the form of bar graphs as shown below. Each graph displays the phenotypic proportion of the progeny. Study the graphs and answer the questions :#47Inheritance of One Gene
A student performed some crosses in plants and represented the result in the form of bar graphs as shown below. Each graph displays the phenotypic proportion of the progeny. Study the graphs and answer the questions :#48Inheritance of One Gene
A student performed some crosses in plants and represented the result in the form of bar graphs as shown below. Each graph displays the phenotypic proportion of the progeny. Study the graphs and answer the questions :#49Inheritance of One Gene
A student performed some crosses in plants and represented the result in the form of bar graphs as shown below. Each graph displays the phenotypic proportion of the progeny. Study the graphs and answer the questions :#50Inheritance of Two Genes
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