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(B) The frequency of crossing over is directly proportional to the physical distance between two genes on a chromosome.When two genes are situated ver

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Hardly any cross over are detected

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(B) The frequency of crossing over is directly proportional to the physical distance between two genes on a chromosome.When two genes are situated very close to each other,the probability of a crossover event occurring between them is extremely low.Therefore,hardly any crossovers are detected between such closely linked genes.This phenomenon is known as tight linkage.

When two genes are situated very close to each other in a chromosome,

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