Frequency of crossing over occurring between two genes located on the same chromosome depends up.

Length of chromosome

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Position of centromere

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Activities of two genes

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Distance between two genes

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Solution

The correct option is C Distance between two genes
The strength of linkage between two genes increases with the decrease in distance between them. The chance of crossing over between two genes decreases with the decrease in distance between them. The strength of linkage decreases with increase in distance between the genes.

So, the correct answer is 'Distance between two genes'.

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