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What is significance of crossing over?...

What is significance of crossing over?

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(i) Exchange of segments leads to new gene combinations which plays an important role in evolution.
(ii) Studies of crossing over reveal that genes
(iii) are arranged linearly on the chromosomes. Genetic maps are made based on the frequency of crossing over.
(iv) Crossing over helps to understand the
(v) nature and mechanism of gene action. If a useful new combination is formed it can be used in plant breeding.
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