Q.134 Botany ⭐ 360° Option Elimination Active

NEET 2024 Botany Question 134 Solution

Topic: Principles of Inheritance and Variation · Official NTA Booklet Code T1

Question

Match List I with List II. List I: A. Two or more alternative forms of a gene; B. Cross of F₁ progeny with homozygous recessive parent; C. Cross of F₁ progeny with any of the parents; D. Number of chromosome sets in plant. List II: I. Back cross; II. Ploidy; III. Allele; IV. Test cross. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (1) : A-III, B-IV, C-I, D-II

📚 Principles of Inheritance and Variation Easy

📋 Given Parameters & Problem Setup

List I (Genetic Terms) A: Alternative forms of a gene; B: F1 progeny crossed with recessive parent; C: F1 progeny crossed with any of the parents; D: Number of chromosome sets

List II (Designations) I: Back cross; II: Ploidy; III: Allele; IV: Test cross

⚡

The 30-Second Exam Hall Shortcut: ⚡ Genetics Vocabulary Lock

⏱️ Save ~25 seconds

Alternative forms of gene = Allele (III); Cross with recessive parent = Test cross (IV); Cross with any parent = Back cross (I); Number of chromosome sets = Ploidy (II)!

1 A. Alternative forms of a gene -> III. Allele

2 B. F1 crossed with recessive parent -> IV. Test cross

3 C. F1 crossed with any parent -> I. Back cross

4 D. Number of chromosome sets in a cell -> II. Ploidy (haploid, diploid, polyploid)

5 Matching order: A-III, B-IV, C-I, D-II -> Option (1) / A.

🛡️

Why You Can 100% Trust This Shortcut: NCERT Biology · Principles of Inheritance and Variation (Mendelian Terminology)

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Define Allele and Ploidy

Alleles are slightly different forms of the same gene occupying identical loci on homologous chromosomes (A -> III). Ploidy refers to the number of complete sets of chromosomes in a cell (e.g., haploidy, diploidy) (D -> II).

Step 2

Distinguish Test Cross from Back Cross

A back cross is any cross between an F1 individual and either of its parents (dominant or recessive) (C -> I). A test cross is specifically a cross between an F1 individual and its homozygous recessive parent, used to determine whether the F1 is homozygous or heterozygous (B -> IV).

Step 3

Assemble Combination

The resulting match is A-III, B-IV, C-I, D-II, which corresponds to Option (1).

⭐

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)

✓ 100% Correct

Verdict & Scientific Reason:

Correctly matches all four genetic concepts with their rigorous formal definitions.

💡

Why this is airtight: None.

2 (2)

✗ Incorrect

Verdict & Scientific Reason:

Inverts the definitions of Test cross and Back cross.

⚠️

Student Fallacy (Why candidates pick this trap): Inverts the definitions of Test cross and Back cross.

3 (3)

✗ Incorrect

Verdict & Scientific Reason:

Mismatches allele with test cross.

⚠️

Student Fallacy (Why candidates pick this trap): Mismatches allele with test cross.

4 (4)

✗ Incorrect

Verdict & Scientific Reason:

Incorrectly assigns ploidy to alternative forms of a gene.

⚠️

Student Fallacy (Why candidates pick this trap): Incorrectly assigns ploidy to alternative forms of a gene.

⚠️

NTA Trap Alert: Test Cross vs Back Cross Inversion

Remembering that all test crosses are back crosses, but confusing which is restricted to the recessive parent.

🛡️ How to avoid the -1 mark: Test cross = strictly recessive parent (to TEST genotype); Back cross = back to ANY parent.

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Core NEET Syllabus Standard

Biology Core Botany · Principles of Inheritance and Variation Standard Benchmark

Core Scientific Principle Tested:

"Genes which code for a pair of contrasting traits are known as alleles, i.e., they are slightly different forms of the same gene... When F1 is crossed with the recessive parent it is called a test cross."

Syllabus Focus: Classical Genetic Terminology and Types of Crosses

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2024 Botany Question 134 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Genetics Vocabulary Lock

Step-by-Step Rigorous Workflow & Mathematical Proof

Define Allele and Ploidy

Distinguish Test Cross from Back Cross

Assemble Combination

360° Option Elimination Engine Key Feature

NTA Trap Alert: Test Cross vs Back Cross Inversion

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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