during-which-phase-of-prophase-i-does-crossing-over-occur-and-why-is-this-phase-

Question

During which phase of prophase I does crossing over occur, and why is this phase significant?

Accepted Answer

Pachytene; it is significant because crossing over increases genetic diversity.

Answer

Diplotene; it is significant because the nuclear envelope breaks down.

Answer

Zygotene; it is significant because homologous chromosomes pair up.

Answer

Leptotene; it is significant because chromatin condenses.