Class 12 · Botany

Principles of Inheritance and Variation

24 topics — from Introduction through Assignment. Expect about 5 questions in NEET — roughly 20 of 720 marks.

Updated 25 Aug 2026 24 topics Botany · Class 12
In short

Principles of Inheritance and Variation is a Class 12 Botany chapter covering 24 topics. Expect about 5 questions in NEET — roughly 20 of 720 marks.

24
Topics
In this chapter
5
Expected questions
≈ 20 of 720 marks
12
Class
Botany
97
Chapters in the syllabus
22 in Botany

Topics covered #

24 topics, in teaching order.

  1. Introduction
  2. Mendelian Principles
  3. Law of Dominance
  4. Law of Segregation
  5. Dominance & Recessive Relationship
  6. Allelic Interactions
  7. Law of Independent Assortment
  8. Maths of Independent Assortment
  9. Extension of Mendelian Principles
  10. Biochemistry of ABO Blood Group
  11. Gene Interactions: I
  12. Gene Interactions: II
  13. Pleiotropism
  14. Chromosomal Basis of Inheritance
  15. Linkage & Recombination
  16. Gene Mapping
  17. Assignment
  18. Qualitative Genetics
  19. Maths of Quantitative Traits
  20. Sex Determination
  21. Mutation: I
  22. Mutation: II
  23. Pedigree Analysis
  24. Assignment

Weightage #

Expect about 5 questions in NEET — roughly 20 of 720 marks.

5 of 180 questions · 20 of 720 marks
This chapter's share of the paper. Weightage is indicative — it reflects how many questions have typically come from here, not a guarantee for any single year.

Practise this chapter #

Reading it once is not the same as being able to answer it under time.

Practice questionsChapter-wise MCQs with solutions Video lecturesTopic-by-topic walkthroughs Chapter testExam-format, timed NEET previous-year questionsPast questions from this chapter AIIMS previous-year questionsOlder AIIMS papers, same syllabus

Next in Botany

← PreviousSexual Reproduction in Flowering Plants

Frequently asked #

How many questions come from Principles of Inheritance and Variation in NEET?
About 5 questions — roughly 20 of the 720 marks available. It is a Class 12 Botany chapter.
What topics does this chapter cover?
24 topics — from Introduction through Assignment. The full list is above.
Where can I practise Principles of Inheritance and Variation?
Chapter-wise MCQs, video lectures, a timed chapter test, and both NEET and AIIMS previous-year questions — all linked above.