Cell Cycle Basics

Overview

In this 45-minute lesson (Lesson 10 of 15), students learn how cells grow and divide by following the stages of the cell cycle: interphase, mitosis, and cytokinesis. They will use interactive diagrams and a short game to sequence and explain each stage.

Learning intentions

• Students will be able to outline the stages of the cell cycle in order.
• Students will be able to describe what happens during interphase, mitosis, and cytokinesis using age-appropriate scientific language.
• Students will be able to use a model (diagram/game) to represent cell division accurately.
• Students will be able to connect cell division to growth and repair in multicellular organisms.

Success criteria

• I can name the three main parts of the cell cycle: interphase, mitosis, cytokinesis.
• I can sequence the stages correctly and match them to what the cell is doing.
• I can explain (in my own words) how DNA is copied and how cells divide.
• I can use evidence from diagrams to justify where a stage belongs in the cycle.

Curriculum links

• Understanding life systems: cell structure and function, including how cells reproduce and maintain life processes.
• Scientific inquiry and skills: using models/diagrams to explain phenomena.
• Communication: using scientific vocabulary to describe processes clearly.
• Thinking and reasoning: predicting and justifying stage placement using patterns in the model.

Lesson structure (45 minutes)

1. (5 min) Quick launch: “What happens next?”

• Display an incomplete cell-cycle diagram (missing one stage label). Ask students to discuss in pairs: “What step should come next and why?”
• Take 2–3 responses, emphasizing that today they will learn the correct sequence and key events.

2. (8 min) Mini-teach with interactive diagram

• Teach the stages in a simple, consistent sequence:
• Interphase: cell grows; DNA is copied.
• Mitosis: nucleus divides so genetic material is separated.
• Cytokinesis: cytoplasm divides; two cells form.
• Use a projected diagram and narrate while students track on their own copy. Pause and ask: “Which stage are we describing right now?”

3. (10 min) Guided practice: Stage matching

• Give each group a set of picture cards (showing DNA copying, nucleus division, cell splitting) and sentence strips (short descriptions).
• Students work together to match each picture to the correct stage and then place the cards in order on a paper strip around a circle or loop.

4. (7 min) Game: Cell Cycle Relay

• Split the class into two teams. Set up stations with labeled stage envelopes (Interphase, Mitosis, Cytokinesis).
• One student at a time retrieves a card (either an event statement or an image cue) and places it into the correct station. Teammates check with a “stage checklist” posted on the wall.
• After a few rounds, stop and correct misconceptions as a whole class (for example, if cytokinesis is incorrectly placed before mitosis).

5. (8 min) Diagram explanation: “Model talk”

• Students complete a short response: “In 3–5 sentences, explain what happens during interphase, mitosis, and cytokinesis.”
• Provide sentence frames on the board to support ESL learners, such as:
• “During interphase, the cell ________.”
• “During mitosis, ________ is separated.”
• “During cytokinesis, the cell ________ and ________.”

6. (5 min) Closure: Exit ticket

• Students answer one sequencing question and one explanation question:
• Sequence: “Which stage comes right after interphase?”
• Explanation: “What is the main purpose of mitosis/cytokinesis in one short sentence?”
• Collect to inform next lesson planning.

Resources

• Projector/interactive board with a blank or partially labelled cell-cycle diagram
• Student diagram handout: interphase, mitosis, cytokinesis cycle template
• Picture cards depicting DNA copying, nucleus division, and cell splitting
• Sentence strips for stage descriptions
• Stage checklist poster for teacher reference and student verification
• Cell Cycle Relay station envelopes and card sets (enough for groups/teams)
• Markers, scissors, glue or tape (optional depending on your card format)
• Sentence frames for explanation writing (for ESL support)
• Exit ticket slips

Assessment

• Formative assessment through:
• Group card-matching accuracy (interphase/mitosis/cytokinesis and order)
• Teacher observation during the relay game (common misconceptions and reasoning)
• Exit ticket sequencing and short explanation
• Use results to decide which stage needs reteaching in Lesson 11.
• Provide immediate feedback during the game and guided practice.

Differentiation

• Support for ESL learners:
• Provide sentence frames and word banks (interphase, mitosis, cytokinesis, DNA, nucleus, cytoplasm)
• Allow oral explanation first (pair talk), then write using frames
• Use visuals and gestures consistently for each stage
• Support for students needing scaffolding:
• Offer a partially completed diagram with stage labels pre-placed, students only add event descriptions
• Provide an illustrated example sentence that students can model
• Extension for advanced learners:
• Ask students to add a “why it matters” sentence: how division helps growth/repair and replaces damaged cells
• Challenge students to compare what changes in interphase vs. mitosis (DNA copying vs. nucleus division)
• SEN considerations:
• Reduce cognitive load by limiting card set size (fewer distractors) for learners who need it
• Use small-group roles (reader, placer, checker) to support attention and participation