What phase does the nuclear envelope begin to break down?
- Correct Answer: interphase
- nitrogenase i
- pasiphaë i
- prophase i
Explanation: Prophase I: The nuclear envelope begins to break down, and the chromosomes condense. Centrioles start moving to opposite poles of the cell, and a spindle begins to form. Importantly, homologous chromosomes pair up, which is unique to prophase I. In prophase of mitosis and meiosis II, homologous chromosomes do not form pairs in this way. During prophase I, crossing-over occurs (see below).
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