Topic: Chromosome theory, linkage and crossing over· Genetics and Evolution

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 ?

1. a, c, b, d

2. a, d, b, c

3. d, b, a, c

4. a, b, c, d

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 1. a, c, b, d

Key idea: Higher recombination frequency means a greater distance between genes. The farthest pair sits at the ends.

The largest value is a-d = 29%, so a and d are the ends. Now a-c = 5% (c is next to a), c-b = 15%, b-d = 9%. Check: a-c + c-b = 20 = a-b, and b-d + a-b = 29 = a-d. Order: a, c, b, d.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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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 ?

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