NEET UG 2021 · Zoology · Question 172
NEET 2021 Zoology, question 172
Question 172 of the NEET 2021 paper (code O1) is a Zoology question from Molecular Basis of Inheritance. Its idea, Chargaff's Rules, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 1.
Updated 2026-10-08
Q172 · Zoology
If Adenine makes 30% of the DNA molecule, what will be the percentage of Thymine, Guanine and Cytosine in it ?
- 1T : 30 ; G : 20 ; C : 20Official answer
- 2T : 20 ; G : 25 ; C : 25
- 3T : 20 ; G : 30 ; C : 20
- 4T : 20 ; G : 20 ; C : 30
Official answer: option 1 · NTA final answer key
Same idea
The only question on Chargaff's Rules
No other NEET paper from 2017–2026 tested this exact idea.
The chapter
Molecular Basis of Inheritance in ten years of NEET
61 questions from 2017–2026, asked in 10 of 10 papers, about 5.8 a paper. DNA Double Helix alone had 16.