Single Choice

In a genetic map, distance between P and Q is 12.4 map unit, Q and R is 7.6 map unit and P and R is 18.2 map unit instead of 20 map unit. This is because of

ACrossing over
BCoupling
CInterference
Correct Answer
DPenetrance

Solution

The crossing over in one region interferes with crossing over in the adjacent region, this phenomenon is known as interference. Interference causes double cross over value to deviate from the expected value. In the question, the expected double cross over value for P and R is 20 map units but the actual observed value comes to be 18.2 map unit which is the result of interference. Option C is the correct answer.

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