Question

Identify the correct statement with respect to linkage and recombination frequency.

• A. If the genes are loosely linked they show low recombination frequency
• B. Two genes with 1.3 percent recombination frequency are loosely linked
• C. If the genes are tightly linked they show high recombination frequency
• D. If the genes are tightly linked they show low recombination frequency

Hint:

- Recombination frequency $\propto$ distance between genes - Low RF → tightly linked - High RF → loosely linked

Answer 1

The Correct Option is D

Concept: Linkage refers to genes located close to each other on the same chromosome. Recombination frequency indicates how often crossing over occurs between them.

Step 1: Understand relationship.

• Tightly linked genes → Close together → Less chance of crossing over → Low recombination frequency
• Loosely linked genes → Far apart → Higher chance of crossing over → High recombination frequency

Step 2: Analyze options.

• (A) Incorrect (loosely linked → high recombination)
• (B) Incorrect (1.3% indicates tight linkage)
• (C) Incorrect (tightly linked → low recombination)
• (D) Correct

Step 3: Final conclusion.
Thus, the correct statement is: \[ If the genes are tightly linked they show low recombination frequency \]