Question:
Assertion (A): Gene pairs present on the same chromosome may be tightly linked or loosely linked.
Reason (R): Frequency of recombination between gene pairs on different chromosomes as a measure of the distance between genes can be used for ‘mapping’ their position on the chromosomes.
Assertion (A): Gene pairs present on the same chromosome may be tightly linked or loosely linked.
Reason (R): Frequency of recombination between gene pairs on different chromosomes as a measure of the distance between genes can be used for ‘mapping’ their position on the chromosomes.
Reason (R): Frequency of recombination between gene pairs on different chromosomes as a measure of the distance between genes can be used for ‘mapping’ their position on the chromosomes.
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Mapping is based on recombination frequencies between linked genes, not genes on different chromosomes.
Updated On: Jan 13, 2026
- Both (A) and (R) are true and (R) is the correct explanation of (A).
- Both (A) and (R) are true, but (R) is not the correct explanation of (A).
- (A) is true, but (R) is false.
(A) is false, but (R) is true.
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The Correct Option is B
Solution and Explanation
Step 1: Gene pairs on the same chromosome can have varying linkage strength — Assertion is true.
Step 2: Recombination frequency is used to map genes, but between gene pairs on the same chromosome, not different ones — Reason is true but misphrased.
Step 3: Since Reason doesn't explain Assertion properly, (B) is correct.
Step 2: Recombination frequency is used to map genes, but between gene pairs on the same chromosome, not different ones — Reason is true but misphrased.
Step 3: Since Reason doesn't explain Assertion properly, (B) is correct.
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