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(D) Interference is defined as the phenomenon where one crossover event reduces the probability of another crossover occurring in the adjacent region.

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(D) Interference is defined as the phenomenon where one crossover event reduces the probability of another crossover occurring in the adjacent region.Mathematically, the coefficient of coincidence $(C)$ is defined as the ratio of observed double crossovers to expected double crossovers.Interference $(I)$ is calculated as $I = 1 - C$.If interference is complete $(I = 1)$, then $1 = 1 - C$, which implies $C = 0$.Since $C = (	ext{Observed double crossovers} / 	ext{Expected double crossovers})$, if $C = 0$, then the observed double crossovers must be $0$.

If interference is complete or $100\%$ then the frequency of observed double crossover will be:

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