The Cell Cycle and Mitosis · seed 1 · A4, ink-friendly. The answer key prints on its own page for grown-ups.

Copy first, then split

Science · Organisms & Life Processes · ages 14-16
Name ______________________   Date ____________

  1. How many cells does mitosis produce?

    • One
    • Two
    • Four

  2. Which order of the cell cycle is correct?

    • G1, S, G2, mitosis
    • Mitosis, G1, S, G2
    • S, G1, mitosis, G2

  3. Mitosis produces daughter cells identical to the parent cell.

    Circle one:   True   False

  4. Where is mitosis happening in your body right now?

    • Skin healing a scratch
    • Nerve cells in the brain
    • Red blood cells carrying oxygen

  5. What happens during S phase?

    • The cell splits in two
    • The cell rests in G0
    • The cell copies its DNA

  6. Why does the DNA have to be copied before division?

    • So the cell can grow bigger
    • So each daughter gets a full identical set
    • So checkpoints switch off

  7. Checkpoints that fail can let faulty cells divide and lead to cancer.

    Circle one:   True   False

  8. A pupil claims the chromosome number halves in mitosis. What is wrong?

    • Nothing, that is correct
    • Doubling the cells happens instead
    • Halving happens in meiosis, not mitosis
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Answer key

For grown-ups. Fold this page away before handing over the rest.

Copy first, then split W1-mt_gllZOZEzW7-s1

  1. Two · One parent cell splits into two identical daughter cells.
  2. G1, S, G2, mitosis · Interphase runs G1, S, G2, and mitosis follows after the copying.
  3. True · Each daughter gets a full copied set, making it a clone of the parent.
  4. Skin healing a scratch · Healing skin grows and repairs by mitosis, while nerves rest in G0.
  5. The cell copies its DNA · S stands for synthesis: the cell replicates its DNA into sister copies.
  6. So each daughter gets a full identical set · Copying first means each daughter inherits a complete identical set.
  7. True · Checkpoints halt faulty cells, so broken brakes let damage spread.
  8. Halving happens in meiosis, not mitosis · The number stays the same in mitosis. Halving belongs to meiosis.
Worksheet · LightMySky