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uranmaximum [27]
3 years ago
6

Crossing over occurs when

Biology
2 answers:
Zanzabum3 years ago
5 0

The correct answer to this question is B:  homologous chromosomes join together to form tetrads during prophase I.

balandron [24]3 years ago
3 0
During meiosis 1, prophase 1 Each chromosome  form tetrads and  and become more and more condensed. This is when crossing over occurs. So your answer is B. 
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