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Cell Cycle Visual Reference Cheat Sheet
A printable reference covering interphase, mitosis, cytokinesis, checkpoints, chromosome changes, and cell cycle regulation for grades 8-12.
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The cell cycle is the ordered process cells use to grow, copy DNA, and divide into two daughter cells. This cheat sheet helps students connect each stage to what is happening inside the cell. It is useful for reviewing diagrams of interphase, mitosis, cytokinesis, and cell cycle checkpoints. Clear visual cues make it easier to compare chromosome behavior from one phase to the next. The core sequence is interphase, mitosis, and cytokinesis. Interphase includes G1 for growth, S for DNA replication, and G2 for preparation before division. Mitosis includes prophase, metaphase, anaphase, and telophase, which separate duplicated chromosomes into two nuclei. Checkpoints help prevent damaged DNA or incomplete replication from being passed to new cells.
Key Facts
- The main cell cycle order is G1 phase, S phase, G2 phase, mitosis, and cytokinesis.
- Interphase includes G1, S, and G2, and it is the part of the cycle when the cell grows and copies DNA.
- During S phase, DNA replication occurs, so each chromosome is copied into two sister chromatids.
- Mitosis follows the order prophase, metaphase, anaphase, and telophase.
- In metaphase, chromosomes line up at the middle of the cell along the metaphase plate.
- In anaphase, sister chromatids separate and move to opposite poles of the cell.
- Cytokinesis divides the cytoplasm, producing two daughter cells after mitosis.
- Cell cycle checkpoints at G1, G2, and M phase help stop division if DNA is damaged or chromosomes are not attached correctly.
Vocabulary
- Cell cycle
- The repeating series of events in which a cell grows, copies its DNA, and divides.
- Interphase
- The stage of the cell cycle when the cell grows, performs normal functions, replicates DNA, and prepares for division.
- Mitosis
- The process that divides one nucleus into two identical nuclei with the same genetic information.
- Cytokinesis
- The division of the cytoplasm that forms two separate daughter cells.
- Sister chromatids
- Identical copies of a chromosome that are joined together after DNA replication.
- Checkpoint
- A control point in the cell cycle where the cell checks for problems before continuing.
Common Mistakes to Avoid
- Confusing interphase with a resting stage is wrong because the cell is actively growing, making proteins, and copying DNA during this time.
- Saying DNA is copied during mitosis is wrong because DNA replication happens earlier during S phase of interphase.
- Mixing up metaphase and anaphase is wrong because chromosomes line up in metaphase, but sister chromatids separate in anaphase.
- Forgetting cytokinesis is wrong because mitosis divides the nucleus, while cytokinesis divides the cytoplasm to form two cells.
- Assuming checkpoints always let the cycle continue is wrong because checkpoints can pause the cycle or trigger cell death if serious damage is found.
Practice Questions
- 1 A cell has 12 chromosomes in G1 phase. How many chromosomes does it have after S phase, and how many sister chromatids are present?
- 2 Put these stages in the correct order: telophase, prophase, anaphase, metaphase.
- 3 If a cell spends 10 hours in interphase and 2 hours in mitosis and cytokinesis, what percent of the total cycle is spent in interphase?
- 4 Why are cell cycle checkpoints important for preventing uncontrolled cell division?