Cell Cycle Phases and Mitosis Stages: Key Concepts for Biology

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9 Terms

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G₁ Phase (Gap 1)

Cell grows, produces organelles and proteins, and prepares for DNA replication; first checkpoint occurs.

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S Phase (Synthesis)

DNA is replicated; chromosomes are duplicated; centrosomes also duplicate.

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G₂ Phase (Gap 2)

Cell continues to grow, checks for DNA replication errors, and prepares for mitosis; final checkpoint before division.

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Prophase

Chromosomes condense, mitotic spindle begins forming, and nuclear membrane starts to break down.

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Prometaphase

Nuclear envelope completely breaks down; spindle fibers attach to kinetochores on chromosomes.

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Metaphase

Chromosomes line up at the metaphase plate (center of the cell).

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Anaphase

Sister chromatids separate and move to opposite poles of the cell.

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Telophase

Chromosomes decondense; new nuclear membranes form around each set of chromosomes.

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Cytokinesis

Cytoplasm divides; forms cleavage furrow in animal cells or cell plate in plant cells.