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Updated Mar 20, 2026

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4 pages

Understanding Mitosis: Stages and Cell Division

Kaity

@kayunity

Mitosis is the process where a cell's nucleus divides to... Show more

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# Mitosis

Mitosis is when the nucleus of the cell divides and has 4 phases-

Prophase Metaphase

Anaphase Telophase

Mitosis occurs in all

Mitosis and Chromosomes

Ever wondered how your body creates new cells? Mitosis is the answer! This is when a cell's nucleus divides through four phases: Prophase, Metaphase, Anaphase, and Telophase. Mitosis happens in all eukaryotic cells except reproductive cells.

Chromosomes are condensed strands of DNA that contain your genetic information. They form an X-shape when a cell prepares to divide, with each arm called a chromatid. You get one chromatid from your mum and one from your dad, held together by a centromere.

Before mitosis even begins, cells prepare during a stage called interphase. The synthesis phase of interphase is when the cell makes a copy of all its DNA, getting ready for division.

Quick Fact: Asexual reproduction produces offspring that are exact genetic copies of the parent. This happens through processes like budding, spores, regeneration, and fission.

The Cell Cycle

The cell cycle is like a cellular roadmap showing how cells grow and divide. It starts with interphase, which includes three stages: Gap 1 (G₁) where the cell grows, Synthesis (S) where DNA doubles, and Gap 2 (G₂) where the cell grows more.

Human cells normally have 46 chromosomes, but after DNA replication in the synthesis phase, they temporarily have 96 chromosomes! This prepares them for division into two complete daughter cells.

Once fully grown in G₂, the cell enters the mitotic phase $M-phase$ . This is when the actual division occurs, creating two identical daughter cells. Some cells can also enter a resting phase called G₀ where they leave the cycle temporarily.

Remember This: Mitosis creates two identical daughter cells, each with exactly the same genetic material as the parent cell. This is crucial for growth and repair in your body!

The Four Phases of Mitosis

Prophase kicks off mitosis with some big changes! The nuclear membrane starts dissolving, centrioles begin forming spindles, and chromatin tightens into visible chromosomes. Think of it as the "preparation phase" where the cell gets ready for division.

In Metaphase, chromosomes line up neatly along the middle of the cell (called the metaphase plate). Centrioles move to opposite ends of the cell and send out spindle fibers that attach to the chromosomes. This perfect alignment ensures each new cell will get the right chromosomes.

During Anaphase, things get moving! The chromosomes split at their centromeres, and sister chromatids are pulled toward opposite ends of the cell. This separation ensures each new cell will receive a complete set of genetic material.

Visualize This: In Telophase, think of the cell doing everything from Prophase but in reverse - nuclear membranes reform and the cell prepares to physically split in two!

Cytokinesis and Interphase

After mitosis comes cytokinesis, the final step where one cell physically splits into two. In animal cells, the cell membrane pinches inward at the cleavage furrow until two separate cells form. It's like tying a drawstring bag in the middle until it becomes two bags!

Plant cells do cytokinesis differently. Instead of pinching, they form a cell plate in the middle - essentially building a new wall between the two forming cells. This difference exists because plant cells have rigid cell walls.

When cells aren't actively dividing, they enter interphase - a resting phase between divisions. But don't be fooled by the name! Interphase is actually when cells do most of their growing and DNA replication to prepare for the next division.

Cool Connection: Everything you learn about the cell cycle helps explain how your body grows from a single cell to trillions of cells, and how it can repair itself when you get a cut or scrape!

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Biology

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Updated Mar 20, 2026

•

4 pages

Understanding Mitosis: Stages and Cell Division

Kaity

@kayunity

Mitosis is the process where a cell's nucleus divides to create two identical daughter cells. This fundamental process occurs in all eukaryotic cells except reproductive cells and is essential for growth, repair, and asexual reproduction in living organisms.

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Mitosis and Chromosomes

Before mitosis even begins, cells prepare during a stage called interphase. The synthesis phase of interphase is when the cell makes a copy of all its DNA, getting ready for division.

Quick Fact: Asexual reproduction produces offspring that are exact genetic copies of the parent. This happens through processes like budding, spores, regeneration, and fission.

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The Cell Cycle

Human cells normally have 46 chromosomes, but after DNA replication in the synthesis phase, they temporarily have 96 chromosomes! This prepares them for division into two complete daughter cells.

Remember This: Mitosis creates two identical daughter cells, each with exactly the same genetic material as the parent cell. This is crucial for growth and repair in your body!

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The Four Phases of Mitosis

Visualize This: In Telophase, think of the cell doing everything from Prophase but in reverse - nuclear membranes reform and the cell prepares to physically split in two!

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Cytokinesis and Interphase

Cool Connection: Everything you learn about the cell cycle helps explain how your body grows from a single cell to trillions of cells, and how it can repair itself when you get a cut or scrape!