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Given diagram...

Question

Given diagram shows a pair of homologous chromosomes during meiosis.
Maximum crossing over will occur between genes

A

A and a, D and d

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B

C and d, c and D

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C

B and c, b and C

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D

A and d, a and D

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Solution

The correct option is D A and d, a and D
An increase in distance between two genes increases the frequency of crossing over, while the closeness of the genes reduces the chances of crossing over. Since (A and d) & (a and D) are located farthest away from each other, maximum crossing over would occur between them.
So the answer is 'A and d, a and D'.

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