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Zoology - Principles of Inheritance and Variation

Practise 192 NEET previous year questions on Principles of Inheritance and Variation, compiled from papers spanning 2002 to 2025. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty NEET tests.

Principles of Inheritance and Variation has been asked in 25 of the 39 years of NEET papers analysed (1988–2026), with 201 questions in all. 51% of them were easy, 43% moderate and 6% tough. Most of its questions came from 2003, with 14 questions that year. In the last three years (2024–2026) it had 22 questions across 13 papers, about 1.7 per paper.

The chapter's 16 topics are not weighted equally: Genetic Disorders (68 questions, 34%), Chromosome Theory of Inheritance (29 questions, 14%), and Multiple Alleles / Co-dominance (19 questions, 9%) have been asked the most. Genetic Disorders has also led over the last five years, with 17 questions. Genetic Disorders has produced the most tough questions (2).

  1. 1What is the pattern of inheritance for polygenic trait?2025Polygenic inheritance
  2. 2Genes and follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotyp2025Mendel's Laws of Inheritance
  3. 3With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mu2025Genetic Disorders
  4. 4Match List I with List II Choose the correct answer from the options given below:2024Test Cross
  5. 5Which one of the following can be explained on the basis of Mendel's Law of Dominance? A. Out of one pair of factors one is dominant and the2024Mendel's Work and Results
  6. 6A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?2024Incomplete Dominance
  7. 7In a plant, black seed color (BB/Bb) is dominant over white seed color (bb). In order to find out the genotype of the black seed plant, with2024Test Cross
  8. 8Match List I with List II : {array}{|l|l|l|l|} & List I & & List II \\ A. & Down's syndrome & I. & 11^{ {th }} chromosome \\ B. & -Thalassem2024Genetic Disorders
  9. 9Given below are two statements: Statement I: When many alleles of a single gene govern a character, it is called polygenic inheritance. Stat2024 (Re-NEET)Incomplete Dominance
  10. 10Match List-I with List-II: {array}{llll} List-I & List-II \ of Inheritance & Example \ .Incomplete dominance & I. Blood groups in human \ .C2024 (Re-NEET)Multiple Alleles / Co-dominance
  11. 11Given below are two statements: Statement I: Failure of segregation of chromatids during cell cycle resulting in the gain or loss of whole s2024 (Re-NEET)Genetic Disorders
  12. 12When a tall pea plant with round seeds was selfed, it produced the progeny of : (a) Tall plants with round seeds and (b) Tall plants with wr2024 (Re-NEET)F1 and F2 Cross
  13. 13Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to : A. Substituti2024 (Re-NEET)Genetic Disorders
  14. 14Broad palm with single palm crease is visible in a person suffering from-2023 (All India)Genetic Disorders
  15. 15Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromos2023 (All India)Chromosome Theory of Inheritance
  16. 16The phenomenon of pleiotropism refers to:2023 (All India)Chromosome Theory of Inheritance
  17. 17Which of the following statements are correct about Klinefelter s Syndrome? A. This disorder was first described by Langdon Down (1866). B. 2023 (All India)Genetic Disorders
  18. 18Which one of the following symbols represents mating between relatives in human pedigree analysis?2023 (All India)Genetic Disorders
  19. 19Match List-I with List-II. Choose the correct answer from the options given below :2023 (Manipur)Working Method
  20. 20A heterozygous pea plant with violet flowers was crossed with a homozygous pea plant with white flowers. Violet is dominant over white. Whic2023 (Manipur)F1 and F2 Cross
  21. 21In which disorder change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine?2023 (Manipur)Genetic Disorders
  22. 22A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The plant2023 (Manipur)F1 and F2 Cross
  23. 23Select the correct statements about sickle cell anaemia. (A) There is a change in gene for beta globin. (B) In the beta globin, there is val2023 (Manipur)Genetic Disorders
  24. 24Select the correct statement/s with respect to mechanism of sex determination in Grasshopper. (A) It is an example of female heterogamety. (2023 (Manipur)Sex Determination
  25. 25XO type of sex determination can be found in:2022 (Phase 1)Sex Determination
  26. 26Given below are two statements: Statement I: Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inherit2022 (Phase 1)Mendel's Experiment
  27. 27Which of the following occurs due to the presence of autosome linked dominant trait?2022 (Phase 1)Genetic Disorders
  28. 28Given below are two statements one is labelled as: Assertion (A) and the other is labelled as Reason (R). Assertion (A): Mendel s law of ind2022 (Phase 1)Mendel's Laws of Inheritance
  29. 29The recombination frequency between the genes a and c is 5 % , b and c is 15 % , b and d is 9 % , a and b is 20 % , c and d is 24 % and a an2022 (Phase 1)Chromosome Theory of Inheritance
  30. 30If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?2022 (Phase 1)Genetic Disorders
  31. 31Given below are two statements : Statement I : Sickle cell anaemia and Haemophilia are autosomal dominant traits . Statement II : Sickle cel2022 (Phase 2)Genetic Disorders
  32. 32The chromosomal theory of inheritance was proposed by :2022 (Phase 2)Chromosome Theory of Inheritance
  33. 33If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also 2022 (Phase 2)Genetic Disorders
  34. 34What is the expected percentage of progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloure2022 (Phase 2)Working Method
  35. 35Select the incorrect match regarding the symbols used in Pedigree analysis:2022 (Phase 2)Genetic Disorders
  36. 36A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of 2022 (Phase 2)F1 and F2 Cross
  37. 37The production of gametes by the parents, formation of zygotes, the F 1 and F 2 plants, can be understood from a diagram called:2021Working Method
  38. 38In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?2021Genetic Disorders
  39. 39Experimental verification of the chromosomal theory of inheritance was done by2020 (Phase 1)Chromosome Theory of Inheritance
  40. 40How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?2020 (Phase 1)Mendel's Experiment
  41. 41Select the correct match.2020 (Phase 1)Genetic Disorders
  42. 42Identify the wrong statement with reference to the gene I that controls ABO blood groups.2020 (Phase 1)Multiple Alleles / Co-dominance
  43. 43Chromosomal theory of inheritance was proposed by:2020 (Phase 2)Chromosome Theory of Inheritance
  44. 44The number of contrasting characters studied by Mendel for his experiments was:2020 (Phase 2)Mendel's Experiment
  45. 45The best example for pleiotropy is:2020 (Phase 2)Chromosome Theory of Inheritance
  46. 46What map unit (Centimorgan) is adopted in the construction of genetic maps?2019 (All India)Chromosome Theory of Inheritance
  47. 47The genetic disorder in which an individual has an overall masculine development, gynaecomastia and is sterile:2019 (All India)Genetic Disorders
  48. 48Which of the following muscular disorders is inherited?2019 (All India)Genetic Disorders
  49. 49The frequency of recombination between gene pairs on the same chromosome as a measure of the distance gene was explained by:2019 (All India)Chromosome Theory of Inheritance
  50. 50In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F 1 generation, pink flowers were obtained. When pink flowe2019 (All India)Incomplete Dominance

Frequently Asked Questions

1.How many questions are available for Principles of Inheritance and Variation?

This chapter includes 192 questions compiled from NEET papers spanning 2002 to 2025.

2.Are these questions only from NEET, or from other exams too?

These are NEET questions specifically for the Principles of Inheritance and Variation chapter. Questions from other exams like AIIMS or JIPMER are organised separately under their respective exam sections.

3.Is Principles of Inheritance and Variation an important chapter for NEET Zoology?

Principles of Inheritance and Variation has appeared in 24 of the 25 years of NEET papers covered here, with 192 questions across 37 papers - about 5 per paper it appears in.

4.What is the difficulty level of Principles of Inheritance and Variation questions in NEET?

Of the 201 questions analysed for this chapter, 51% are easy, 43% moderate and 6% tough. 2003 had the most, with 14 questions.

5.Which topics in Principles of Inheritance and Variation should I focus on?

These topics have carried the most weightage in Principles of Inheritance and Variation:

  • Genetic Disorders - 68 questions (34%)
  • Chromosome Theory of Inheritance - 29 questions (14%)
  • Multiple Alleles / Co-dominance - 19 questions (9%)
  • Genetic Disorders has produced the most tough questions (2).
6.Is Principles of Inheritance and Variation's weightage in NEET going up or down?

Across all 37 papers analysed, Principles of Inheritance and Variation has averaged about 5.2 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.