AP BIOLOGY

Detailed explanation-1: -During prophase, the chromosomes condense, the nucleolus disappears, and the nuclear envelope breaks down.

Detailed explanation-2: -Nuclear membrane disappears in late prophase. Longest phase of mitosis is prophase. During prophase, which occurs after G2 interphase, the cell prepares to divide by tightly condensing its chromosomes and initiating mitotic spindle formation.

Detailed explanation-3: -The membrane that disappears late prophase is the nuclear membrane. The nuclear membrane and nucleolus both disintegrate completely in the late prophase.

Detailed explanation-4: -Prophase I Events that occur during prophase of mitosis also occur during prophase I of meiosis. The chromosomes coil up, the nuclear membrane begins to disintegrate, and the centrosomes begin moving apart.