BrainIt

Biology

Molecular Basis of Inheritance

DNA structure and replication, transcription, the genetic code, translation, the lac operon, and DNA fingerprinting run through this chapter, with the classic experiments behind them. NEET tests both recall and reasoning, from Griffith and Hershey-Chase setups to operon logic.

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 4 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 2026

In the lac operon, the z gene codes for:
  1. A.permease
  2. B.transacetylase
  3. C.beta-galactosidase
  4. D.the repressor of lac operon
Answer and explanation

Answer: C

In the lac operon the structural gene z codes for beta-galactosidase, the enzyme that hydrolyses lactose into glucose and galactose. Hence C is correct. The y gene codes for permease, the a gene for transacetylase, and the separate regulatory i gene codes for the repressor protein.

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 12-question mock on the exam screen.

Nearby Biology chapters

Questions

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

Molecular Basis of Inheritance carried 4 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?

In the BrainIt app, free until the 2027 exam: its bank holds 50,000 past NTA questions tagged to all 83 chapters, including this one, with accuracy tracked per chapter. A sample question from this chapter is 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.

Something here wrong or out of date? Email irshad@moonlightart.space and a person will read it.