NEET 2022 Botany Gene Mapping MCQ Question with Solution

The recombination frequency between the genes a & c is 5%, b & c is 15 %, b & d is 9%, a & b is 20%, c & d is 24% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?

A

a, b, c, d

B

a, c, b, d

C

a, d, b, c

D

d, b, a, c

Correct Answer

Option B

Detailed Explanation

Chapter: Principles of Inheritance and Variation

Class: 12 Topic: Gene Mapping Difficulty: 🔴 Hard

✅ Ans: B — a, c, b, d

Use the largest distance to establish the order:

$a-c=5$
$b-c=15$
$a-b=20$ → $5+15=20$ , so c lies between a and b
$b-d=9$
$a-d=29$ → $20+9=29$

Therefore:

\boxed{a-c-b-d}

🧠 NEET Trick

If two smaller distances add up to a larger distance, the middle gene lies between them.

Correct option: B, not A.

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All Botany Questions Principles of Inheritance and Variation Questions NEET 2022 PYQ

NEET 2022 Botany Gene Mapping MCQ Question

Correct Answer

Detailed Explanation

Chapter: Principles of Inheritance and Variation

✅ Ans: B — a, c, b, d

🧠 NEET Trick

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