A specific kind of mutation causes defective proteins that participate in the formation of the cleavage furrow. Which of the following mitotic phases will be affected?

Cytokinesis

Explanation:

The cleavage furrow is a 'pinching' or invagination in the cell membrane that occurs before the cell cytoplasm splits in two to form two daughter cells.

This occurs towards the end of mitosis, during telophase. This means that cytokinesis will not be able to proceed properly. Cytokinesis is when the cytoplasm divides to form two new cells. Without the cleavage furrow, the cell is not divided in two, and the new daughter cells cannot form. Therefore, cytokinesis cannot proceed properly.

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