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The distance between two genes in a chromosome is measured in cross-over units which represent

(a) ratio of crossing over between them

(b) percentage of crossing over between them

(c) number of crossing over between them

(d) none of these.

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Best answer

Correct option (b) percentage of crossing over between them

Explanation:

The physical distance between two genes determines both the strength of the linkage and the frequency of the crossing over between two genes. The strength of the linkage increases with the closeness of the two genes. On the other hand the frequency of crossing over increases with the increase in the physical distance between the two genes.

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