Question:
Results from a test cross involving genes linked in coupling show 20% crossing over. If a similar test cross is made involving the same gene in repulsion, one would expect the percentage of crossing over to:
Results from a test cross involving genes linked in coupling show 20% crossing over. If a similar test cross is made involving the same gene in repulsion, one would expect the percentage of crossing over to:
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Crossing over: same in coupling and repulsion.
Depends on physical distance.
Phase does not affect frequency.
Depends on physical distance.
Phase does not affect frequency.
Updated On: Aug 18, 2026
- Be approximately the same
- Be distinctly less
- Be distinctly more
- Have no relationship
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Crossing over frequency depends on the distance between genes.
It is not affected by coupling or repulsion phase.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand linkage and crossing over.
Step 3: Detailed Explanation:
Crossing over frequency is determined by the physical distance between genes.
Coupling or repulsion phase does not change the frequency.
Thus, the percentage of crossing over will be approximately the same.
Step 4: Final Answer:
The percentage of crossing over will be approximately the same.
Hence, the correct option is (A).
Crossing over frequency depends on the distance between genes.
It is not affected by coupling or repulsion phase.
Step 2: Key Formula or Approach:
No specific formula.
Need to understand linkage and crossing over.
Step 3: Detailed Explanation:
Crossing over frequency is determined by the physical distance between genes.
Coupling or repulsion phase does not change the frequency.
Thus, the percentage of crossing over will be approximately the same.
Step 4: Final Answer:
The percentage of crossing over will be approximately the same.
Hence, the correct option is (A).
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