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Genetics - NEET Previous Year Questions

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Team eSaral

eSaral Academic and Editorial Team

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Summary

Genetics is one of the highest-weightage NEET Biology chapters, contributing 5–7 questions annually with a strong focus on Mendelian inheritance, dihybrid crosses, sex-linked inheritance, chromosomal disorders, and pedigree analysis, while this page provides previous year questions, key concepts, and preparation strategies to master recurring NEET patterns.

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Why Genetics Is a Must-Master Chapter for NEET Biology 

Parameter

Details

NCERT Chapter

Principles of Inheritance and Variation (Class 12, Chapter 5)

Average questions per NEET paper

5–7 questions

Marks weightage

20–28 marks per year

Difficulty level

Moderate — conceptual + problem-solving

Most tested subtopics

Mendel's laws, dihybrid cross ratios, sex determination, sex-linked inheritance, chromosomal disorders

Closely related chapter

Molecular Basis of Inheritance (Class 12, Chapter 6) — 3–5 more questions

💡 Expert Tip by eSaral Academic Team, IIT Bombay Faculty: "Genetics is one of the few NEET Biology chapters where you can predict the exact type of question before you see it. NEET has tested dihybrid cross ratios, sex-linked inheritance numerical problems, and ABO blood group inheritance almost every year since 2013. Master these three question types and you have 8–10 marks locked before the exam begins."

Genetics NEET Previous Year Questions with Solutions

High-Frequency Subtopics in Genetics NEET PYQs 

Based on analysis of NEET papers from 2013 to 2025:

Subtopic

Frequency

What NEET Tests

Mendel's Laws (Dominance, Segregation, Independent Assortment)

Very High

Ratio prediction, law identification

Monohybrid and Dihybrid cross ratios

Very High

F1/F2 ratio calculation, phenotype/genotype counts

Incomplete dominance and codominance

High

ABO blood groups, sickle cell anaemia

Sex determination mechanisms

High

XX-XY, ZW-ZZ, XO systems

Sex-linked (X-linked) inheritance

High

Colour blindness, haemophilia problems

Chromosomal disorders

High

Down's, Turner's, Klinefelter's syndrome

Linkage and crossing over

Medium

Morgan's experiments, recombination frequency

Pedigree analysis

Medium

Autosomal dominant/recessive, X-linked patterns

Mutation types

Medium

Point mutation, frameshift, chromosomal

Polygenic inheritance

Low-Medium

Skin colour, height inheritance

Key Concepts Summary for Quick Revision 

Concept

Key Fact

Monohybrid F2 ratio

3:1 (phenotypic); 1:2:1 (genotypic)

Dihybrid F2 ratio

9:3:3:1

Test cross (monohybrid heterozygote)

1:1

Test cross (dihybrid heterozygote, unlinked)

1:1:1:1

Incomplete dominance F2

1:2:1 (phenotypic = genotypic)

Codominance example

ABO blood groups (I^A I^B = AB)

Colour blindness / Haemophilia

X-linked recessive

Sex determination (humans)

XX = female; XY = male

Down's Syndrome

Trisomy 21 (47 chromosomes)

Turner's Syndrome

45,XO (monosomy X)

Klinefelter's Syndrome

47, XXY

Linkage

Genes on the same chromosome; violates independent assortment

Recombination frequency

Distance between linked genes

How to Prepare Genetics for NEET 

Step 1: Master Mendel's Laws with Punnett Squares

Do not move to complex Genetics topics until monohybrid and dihybrid cross Punnett squares are completely automatic. Practise 20–30 cross problems — including test crosses and back crosses — until ratios come to you without drawing the full grid.

Step 2: Learn All Chromosomal Disorders as a Table

Down's (Trisomy 21), Turner's (45,XO), Klinefelter's (47,XXY), Patau's (Trisomy 13), Edward's (Trisomy 18) — memorise chromosome composition, phenotype, and distinguishing features for each. NEET tests these as 1-mark identification questions.

Step 3: Solve Sex-Linked Inheritance Problems Methodically

Always write genotypes using full notation (X^H, X^h, Y). Never assume — always derive the answer from the cross. NEET sex-linked problems are straightforward if you use proper notation; they become error-prone if you try to solve them in your head.

Step 4: Work Through All NEET PYQs from This Chapter

Pattern recognition from past papers is irreplaceable for Genetics. Visit eSaral's NEET previous year questions and solve all Genetics PYQs year by year. After 5–6 years of papers, NEET's preferred question formats become very familiar.

Step 5: Connect Genetics to the Molecular Basis of Inheritance

NEET treats these as two chapters but the questions overlap significantly. DNA replication, transcription, translation, and mutation concepts directly connect to Genetics. Prepare both chapters together for maximum efficiency.

Frequently Asked Questions

How many questions come from Genetics in NEET every year?

Genetics (Principles of Inheritance and Variation) contributes 5–7 questions per NEET paper, worth 20–28 marks. When combined with the related Molecular Basis of Inheritance chapter, the total reaches 8–12 questions. It is consistently one of the most heavily tested Biology chapters in NEET. Mendel's laws, sex-linked inheritance, and chromosomal disorders appear almost every year.

What is the most important topic in Genetics for NEET?

Mendelian genetics — specifically dihybrid cross ratios and test cross interpretation — is the single most important Genetics topic for NEET. Sex-linked inheritance (colour blindness and haemophilia numerical problems) is a close second. Together, these two areas account for 3–4 questions per year. Chromosomal disorders (Down's, Turner's, Klinefelter's) are also consistently tested and can be prepared with a simple memorisation table.

What is the difference between incomplete dominance and codominance in NEET?

In incomplete dominance, the heterozygote shows a phenotype intermediate between the two homozygotes — neither allele fully dominates (e.g., pink flowers from red × white). In codominance, both alleles are fully expressed simultaneously in the heterozygote — neither suppresses the other (e.g., ABO blood group AB from I^A × I^B). NEET distinguishes these in questions about ABO blood groups and flower colour inheritance.

What are the chromosomal compositions of major genetic disorders tested in NEET?

Down's Syndrome has trisomy 21 (47 chromosomes). Turner's Syndrome has monosomy X (45,XO — female phenotype, infertile). Klinefelter's Syndrome has 47,XXY (male phenotype, infertile, gynaecomastia). Patau's Syndrome has trisomy 13 (47 chromosomes, severe defects). Edward's Syndrome has trisomy 18 (47 chromosomes). All result from non-disjunction during meiosis.

Where can I find all NEET Biology previous year questions chapter wise?

Complete chapter-wise NEET previous year questions for Biology, Physics, and Chemistry — with detailed solutions — are available at eSaral's NEET PYQ page. Questions are organised by chapter, so you can target Genetics specifically during revision without working through full papers.

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Team eSaral

eSaral Academic and Editorial Team

Team eSaral is the collective author profile for educational content created by eSaral’s teachers and academic contributors. The team draws on expertise from IIT graduates, doctors, experienced educators and subject specialists to develop resources for JEE, NEET and school students. Our articles aim to explain concepts clearly and help students study with confidence.

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