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(A) Chromosome mapping is based on the principle that the frequency of recombination (cross over value) between two genes is directly proportional to

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Cross over values

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(A) Chromosome mapping is based on the principle that the frequency of recombination (cross over value) between two genes is directly proportional to the physical distance between them on the chromosome.$1$ map unit (centimorgan) is equivalent to $1\%$ cross over frequency.Therefore,cross over values are the primary evidence used to determine the relative positions and distances of genes on a chromosome.

In the construction of chromosome maps,the evidence is derived mainly from

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