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9 December, 15:16

When crossing-over takes place, chromosomes

a. exchange corresponding segments of DNA.

b. produce new genes.

c. decrease in number.

d. mutate in the first division.

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  1. 9 December, 15:24
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    I think the correct answer from the choices listed above is option A. When crossing-over takes place, chromosomes exchange corresponding segments of DNA. Corresponding genes on non-sister chromatids are exchanged at chiasmata. Hope this answers the question.
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