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Question

Crossing over occurs in 


A
Anaphase I
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B
Prophase I
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C
Anaphase II
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D
Prophase II
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E
Metaphase I
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Solution

The correct option is B Prophase I
Crossing over or Chromosomal crossover  is the exchange of genetic material between homologous chromosomes resulting in recombinant chromosomes.
The chromosomes segregate during Meiosis I which is made up of prophase I, Metaphase I, Anaphase I, and Telophase I. The Prophase I is further differentiated into 5 stages- Leptotene, Zygotene, Pachytene, Diplotene, Diakinesis.  During the Pachytene phase of Prophase I homologous chromosomes pair up and become attached to one another. At this time, crossing over takes place which involves the movement of sections of DNA between the non-sister chromatids of homologous chromosomes and allows for independent assortment. 

Biology

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