AP BIOLOGY

Detailed explanation-1: -These tubules, collectively known as the spindle, extend from structures called centrosomes-with one centrosome located at each of the opposite ends, or poles, of a cell.

Detailed explanation-2: -Telophase is the fifth and final phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. Telophase begins once the replicated, paired chromosomes have been separated and pulled to opposite sides, or poles, of the cell.

Detailed explanation-3: -Centrioles split and move to the opposite ends of the cell at the poles towards the end of Prophase.

Detailed explanation-4: -Thus, the correct answer is ‘Prophase. ‘