During Telophase, which event occurs?

During Telophase, which event occurs?

• A. Chromosomes condense and spindle fibers reappear
• B. Spindle fibers disappear and a nuclear envelope forms around the daughter chromosomes
• C. Nucleolus disappears
• D. Chromosomes align at the equator

Answer: (B)

Telophase is the stage when the cell finishes mitosis and starts rebuilding two separate nuclei. The defining events are that the chromosomes have reached the poles and begin to de-condense, and the nuclear envelope re-forms around each set of chromosomes, creating two distinct nuclei. The nucleolus also reappears inside these new nuclei, and the spindle apparatus disassembles as its job is done. This is why the statement that describes spindle fibers disappearing and a nuclear envelope forming around the daughter chromosomes fits telophase best. The other described events belong to earlier stages: chromosomes condensing and spindle fibers forming are prophase events; the nucleolus disappearing is something that happens before the nucleus re-forms; and aligning at the cell's equator occurs in metaphase.

Telophase is the stage when the cell finishes mitosis and starts rebuilding two separate nuclei. The defining events are that the chromosomes have reached the poles and begin to de-condense, and the nuclear envelope re-forms around each set of chromosomes, creating two distinct nuclei. The nucleolus also reappears inside these new nuclei, and the spindle apparatus disassembles as its job is done.

This is why the statement that describes spindle fibers disappearing and a nuclear envelope forming around the daughter chromosomes fits telophase best. The other described events belong to earlier stages: chromosomes condensing and spindle fibers forming are prophase events; the nucleolus disappearing is something that happens before the nucleus re-forms; and aligning at the cell's equator occurs in metaphase.