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Biology

Molecular Basis of Inheritance

A Biology chapter of the NEET syllabus, and how to practise it for the computer-based exam.

Exam rules change between cycles. Confirm dates, syllabus and pattern against NTA's official site. We are not NTA.

Weightage: what the paper actually did

Molecular Basis of Inheritance carried 6 questions in the NEET 2026 paper. One paper is a data point, not a destiny: NTA moves weight between chapters every cycle, which is why the weightage tables deserve care. The stable facts are the paper's shape: 180 questions, 720 marks, +4 right, −1 wrong.

Sample PYQs from this chapter

Real questions NTA asked from Molecular Basis of Inheritance, with the answer and the working. Try before you peek.

Question 1 · NEET 2020

Which of the following statements is correct?
  1. A.Adenine pairs with thymine through one H- bond
  2. B.Adenine pairs with thymine through three H-bonds
  3. C.Adenine does not pair with thymine
  4. D.Adenine pairs with thymine through two H- bonds
Answer and explanation

Answer: D

In double-stranded DNA, adenine pairs with thymine through two hydrogen bonds, while guanine pairs with cytosine through three. Complementary base pairing explains the hydrogen-bond count asked here.

Question 2 · NEET 2026

Which of the following enzymes synthesizes precursor mRNA?
  1. A.RNA polymerase I
  2. B.RNA polymerase II
  3. C.RNA polymerase III
  4. D.DNA polymerase
Answer and explanation

Answer: B

Eukaryotes use three nuclear RNA polymerases with a clean division of labour. RNA polymerase II transcribes the precursor of mRNA, the heterogeneous nuclear RNA (hnRNA), which is then capped, tailed and spliced into mature mRNA. RNA polymerase I handles the ribosomal RNAs and RNA polymerase III the tRNAs, 5S rRNA and small nuclear RNAs. NCERT Class 12, Molecular Basis of Inheritance.

How to practise Molecular Basis of Inheritance

Chapter by chapter, against real past-paper questions, on a screen: NEET is computer based from 2027. Read the chapter once, then attempt its PYQs until your accuracy stops climbing, and let the wrong answers tell you which lines to reread. If the chapter keeps refusing to stick, that has its own guide. There is also a free NEET mini mock with answers.

Nearby Biology chapters

Questions

How many questions did Molecular Basis of Inheritance have in NEET 2026?

Molecular Basis of Inheritance carried 6 questions in the NEET 2026 paper. Weightage shifts between cycles, so treat it as a probability, not a promise.

Where can I practise Molecular Basis of Inheritance PYQs for NEET?

Explore available chapter-wise NEET practice in BrainIt, free until the 2027 exam. Review explanations and track chapter accuracy to guide your revision. Sample questions from this chapter are on this page.

Is Molecular Basis of Inheritance important for NEET 2027?

It is part of the Biology syllabus the paper draws from, and NEET 2027 is computer based, so practise it on a screen. Your own accuracy in the chapter matters more than any weightage table: a heavy chapter you already score well on needs less time than a light one you keep missing.

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