Mitosis Stages Quiz

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Questions and Answers

What occurs during prophase of mitosis?

Chromatids separate and move to opposite ends of the cell
Spindle fibers extend from centrioles (correct)
Nuclear membrane reappears
Chromosomes return to chromatin

Which statement accurately describes metaphase?

Spindle fibers align chromosomes at the center of the cell (correct)
Centrioles move to opposite ends of the cell
Nuclear envelope begins to form
Chromosomes are pulled apart at the centromere

During which phase do chromatids separate at the centromere?

Anaphase (correct)
Prophase
Metaphase
Telophase

What happens to chromosomes during telophase?

<p>Chromosomes return to chromatin (C)</p> Signup and view all the answers

What role do spindle fibers play during metaphase?

<p>They align chromosomes at the cell's center (B)</p> Signup and view all the answers

Flashcards

Prophase

Chromatin condenses into visible chromosomes, each composed of two sister chromatids joined at the centromere. The nuclear envelope breaks down, and spindle fibers begin to form from the centrioles, which move to opposite poles of the cell.

Metaphase

Chromosomes line up at the center of the cell, attached to the spindle fibers at their centromeres.

Anaphase

Sister chromatids separate at the centromere and are pulled apart by the spindle fibers, moving towards opposite poles of the cell.

Telophase

The spindle fibers disappear, the chromosomes uncoil and become less visible, and a new nuclear envelope forms around each set of chromosomes, creating two daughter nuclei.

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Cytokinesis

The cytoplasm divides, creating two daughter cells, each with a complete set of chromosomes, thus completing the cell cycle.

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Study Notes

Mitosis Stages

Prophase:
- Chromosomes condense (from S phase, where they were composed of 2 chromatids connected by a centromere).
- The nuclear membrane and nucleolus disappear.
- Centrioles move to opposite ends of the cell.
- Spindle fibers (made of microtubules) extend from the centrioles.
Metaphase:
- Spindle fibers move chromosomes to the center of the cell.
Anaphase:
- Chromatids of each chromosome separate at the centromere.
- Spindle fibers pull chromatids towards centrioles at opposite ends of the cell.
Telophase:
- Spindle fibers disappear.
- Chromosomes return to chromatin form.
- Nuclear envelope and nucleolus reform.