Arrival
Point to the first and last picture in the cell strip. What changed?
Offer the same strip as large print or tactile paper shapes; accept pointing before speaking.
Use this three-step picture to show your first idea.
Starter
Recall three things from earlier lessons. Show one answer at a time.
Ask the three retrieval questions in order, reveal answers after all pupils respond, then point to the three success criteria.
- Which process uses energy to move a substance from low to high concentration?
- In osmosis, which substance moves through a partially permeable membrane?
- In a eukaryotic animal cell, which structure holds the chromosomes?
Today, I can:
- I can order interphase, four mitosis phases and cytokinesis.
- I can show that the two new body cells have matching chromosome sets.
- I can explain how mitosis helps growth or repair.
I do
Watch the full model: copy the DNA, separate the matching chromosomes, then split the cell.
Show the paper-strip model; pause for the show-me check before the next stage.
Words
The cell cycle includes interphase, mitosis and cytokinesis.
The cell copies its DNA in interphase.
Mitosis separates the chromosome sets.
Each new nucleus receives a matching set of chromosomes.
Cytokinesis splits one cell into two.
In prophase, chromosomes become easier to see.
In metaphase, chromosomes form a line.
In anaphase, the two copies of each chromosome are pulled to opposite ends.
In telophase, each set gains a nucleus.
Full model: Interphase: copy DNA. Mitosis: prophase (condense), metaphase (line up), anaphase (the two copies of each chromosome are pulled to opposite ends), telophase (two nuclei). Cytokinesis: split the cell.
Show me: is DNA copied before, during or after mitosis?
Answer: Before mitosis, in interphase.
We do
Complete the missing step in the part-done model. Then place the paper strips in both new cells.
Run paired talk before the card or select task; offer the support route without giving the missing step.
One-minute reset: use the agreed move, then return to one step.
Part-done model: Interphase: copy DNA. Mitosis: prophase (condense), metaphase (line up), ________, telophase (two nuclei). Cytokinesis: split the cell.
Speak first: First the cell …; then the chromosome sets …; last the cell …
Support route: Use the full model beside the faded one. Point to the two nuclei before choosing the missing step.
Stretch route: Explain why swapping mitosis and DNA copying would break the model.
Put the three steps in order
Choose a stage for each numbered place. Then check your sequence.
We do 2
Choose one hinge answer. Show it at the same time as the group.
Use simultaneous whiteboards, point or symbol cards. Apply the decision rule and parallel hinge in the note.
All-pupil hinge: A new body-cell model starts with six chromosomes. After DNA copying, mitosis and cell division, what should each daughter cell contain?
Tell a partner one reason for your choice. All pupils show an answer together.
Independent
Use the model to explain how cell division helps replace damaged body cells.
One adult supports pupils; the other holds the group, swapping roles across the week. Record actual independence and prompt level.
One-minute reset: use the agreed move, then return to one step.
F: Order the three cards and show the same chromosome colours in each new cell. First …; then …; last …
M: Explain why each new cell has a matching chromosome set. Each new cell matches because …
H: Predict what would happen to the sets if copied chromosomes did not separate evenly. If the copies did not separate evenly, then … because …
Speak before you write: The daughter cells match because …
You can plan in any language.
Go deeper: How do copy, separate and split work together when new cells are needed for repair?
Early-finisher stretch: Fault finder: compare two faulty models. One skips DNA copying; the other puts both copies of one chromosome in one nucleus. Find each first error and propose a repair.
Show it your way: point, sign, speak, draw, type, write, use a scribe or use a staff-captured photo.
Try it with kit · prepared model
Kit: Large prepared paper chromosome strips, two cell outlines, tray
- Place the prepared strips into the model cell outlines and check the matching sets.
Risk: Loose paper strips could fall or be mouthed.
Safe: Use large prepared strips at a desk. Keep them out of mouths and collect dropped pieces.
Check the school risk assessment and exact prepared kit. This is optional model rehearsal, not a claimed core practical.
Review
Tell your partner what you changed after feedback. Mark a real self-edit // and read it back when asked ?.
Give one specific piece of VF, allow a true self-edit and record only feedback that occurred.
One-minute reset: use the agreed move, then return to one step.
Exit
Show how you know: order the three stages and explain why the new cells match.
Hear every response through speech, sign, point, drawing or writing; use it to change the next example or prompt.
Check today’s success:
- I can order interphase, four mitosis phases and cytokinesis.
- I can show that the two new body cells have matching chromosome sets.
- I can explain how mitosis helps growth or repair.
My feedback was … Name the feedback you heard at Review.
Next I need to … Check both matching chromosome sets and the final cell split.
How I know: My model shows two matching cells, and I can explain the order.
Your teacher hears your answer and uses it to choose the next example or prompt.