AP BIOLOGY

Detailed explanation-1: -Prophase II: During prophase II, the chromosomes begin to recondense and spindle fibers begin to form once again. These spindle fibers seek out the sister chromatids that are present in the cell.

Detailed explanation-2: -During prophase II, chromosomes condense and the nuclear envelope breaks down, if needed. The centrosomes move apart, the spindle forms between them, and the spindle microtubules begin to capture chromosomes.

Detailed explanation-3: -In prophase of mitosis, specialized regions on centromeres called kinetochores attach chromosomes to spindle fibers. The centromere is the part of a chromosome that links sister chromatids. During mitosis, spindle fibers attach to the centromere via the kinetochore.

Detailed explanation-4: -Chromosomes attach to spindle fibers during metaphase. Chromosomes contain a cell’s DNA or genetic information. Before entering mitosis, the cell duplicates its DNA during the synthesis stage of the cell cycle. This DNA must be split in order to place one of each copy into two separate cells.