MyCompetitiveExams Logo MyCompetitiveExams
MyCompetitiveExams Logo MyCompetitiveExams
Search 1,140+ Questions
Chapters, formulas, speed tricks
→
⚡ Brahmastra NEET 2027
720 MARKS

Dynamic 180-question full-length simulator mixed dynamically from all 6 years for 2027 & 2026 aspirants.

Launch Brahmastra 2027 Test →
Start Practice →
100% Free · No Login Required
Q.126 Botany ⭐ 360° Option Elimination Active
Vault ↗

NEET 2021 Botany Question 126 Solution

Topic: Principles of Inheritance and Variation · Official NTA Booklet Code M1
NEET 2021 Botany Question 126: Graphical Representation of Genetic Crosses: Punnett Square

Question

The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called:

  1. (1)Bullet square
  2. (2)Punch square
  3. (3)Punnett square
  4. (4)Net square
✓
Verified Against NTA Final Answer Key
Option (3) : Punnett square
📚 Principles of Inheritance and Variation Easy
📋 Given Parameters & Problem Setup
Diagram Purpose Calculate genotypes of gametes, zygotes, F1 and F2 offspring in a genetic cross
⚡

The 30-Second Exam Hall Shortcut: ⚡ Reginald C. Punnett = Punnett Square

⏱️ Save ~10 seconds

The graphical checkerboard diagram used to calculate and visualize all possible combinations of gametes and offspring genotypes in F1 and F2 generations was devised by the British geneticist Reginald C. Punnett   ⟹  \implies Punnett Square! Match Option (3)!

1 Diagrammatic grid representation of genetic crosses is known as a Punnett square.
2 Devised by British geneticist Reginald C. Punnett.
3 Horizontal and vertical rows represent gametes from male and female parents; internal squares show resulting zygote genotypes.
4 Match Option (3).
🛡️
Why You Can 100% Trust This Shortcut: Canonical NCERT Genetics on Mendelian Crosses and Punnett Square.
📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Definition and Historical Context

The production of gametes by parents, the formation of zygotes, and the resulting F1F_1 and F2F_2 generations can be systematically mapped using a checkerboard graphical representation:

Mendelian Checkerboard=Punnett Square (devised by Reginald C. Punnett)\text{Mendelian Checkerboard} = \mathbf{\text{Punnett Square (devised by Reginald C. Punnett)}}
Step 2

Structural Architecture of a Punnett Square

All possible types of gametes produced by the male parent are listed across the top, while gametes produced by the female parent are listed along the left side. Each internal cell represents the union of two haploid gametes, visually illustrating the resulting diploid zygotic genotypes and genotypic ratios.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan
1 1
✗ Incorrect
Verdict & Scientific Reason:

Fictitious distractor; no such genetic diagram exists.

⚠️
Student Fallacy (Why candidates pick this trap): Phonetic similarity to Punnett square.
2 2
✗ Incorrect
Verdict & Scientific Reason:

Fictitious distractor fabricated as an exam distractor.

⚠️
Student Fallacy (Why candidates pick this trap): Phonetic similarity.
3 3
✓ 100% Correct
Verdict & Scientific Reason:

The Punnett square is the standard textbook graphical representation devised by Reginald C. Punnett.

💡
Why this is airtight: None. Textbook definition.
4 4
✗ Incorrect
Verdict & Scientific Reason:

Fictitious distractor playing on the suffix "-net".

⚠️
Student Fallacy (Why candidates pick this trap): Misremembering the scientist's surname.
⚠️

NTA Trap Alert: Phonetic Word-Play Distractors

NTA created playful distractors: "Bullet square", "Punch square", and "Net square" alongside "Punnett square".

🛡️ How to avoid the -1 mark: Remember British geneticist: Reginald C. Punnett.
📖

Core NEET Syllabus Standard

NEET / NCERT Biology · Principles of Inheritance and Variation Standard Benchmark
Core Scientific Principle Tested:

"The production of gametes by the parents, the formation of the zygotes, the F1 and F2 plants can be understood from a diagram called Punnett Square as developed by a British geneticist, Reginald C. Punnett."

Syllabus Focus: Inheritance of One Gene: Punnett Square
✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Ready to attempt under real exam pressure?

Test your speed and accuracy in the authentic 200-minute timed NTA simulator.

Launch NEET 2021 CBT Test →

Spotted a mistake in this solution? Report an error (support@mycompetitiveexams.com)

⚖️ Legal & Fair Dealing Notice: Sourced from publicly released NEET 2021 question papers and NEET answer keys for private study, research, and non-commercial educational practice under Fair Dealing (Section 52(1)(a) of the Indian Copyright Act, 1957). Not affiliated with or endorsed by NTA or NMC.

Solve 4 NEET Questions a Day — One per Subject

Cover all 1,140 official NEET questions in 285 days at your own pace. Progress is saved on your device. No login needed.