Question

If interference is complete or 100 percent, then the frequency of the observed double crossover will be

• A. Equal to expected frequency
• B. Greater than expected frequency
• C. Lesser than expected frequency
• D. Zero

Answer 1

The correct option is D Zero

If interference is complete or 100 percent, then the frequency of the observed double crossover will be zero. This is because a crossover in one region will completely block the crossover in adjacent region. In some regions of chromosomes there is never any observed double crossover. Here, the coefficient of coincidence is zero and interference is complete.

Also, Interference (I) = 1 − observed double crossover.

If interference is complete then the Observed double cross over will be zero.

Thus, the correct answer is 'Zero.'