Name the stage of mitosis from a picture

Grade 9 Science Worksheet - Challenge Me

Circle the best answer.

1. Read this first

   Use this

   Four cell drawings of one animal cell with 8 chromosomes (model, not to scale), shown in mixed order. Q: 8 thick X-shaped chromosomes scattered inside, the nuclear envelope breaking into pieces, spindle fibers just starting. S: two nuclei, each in a new nuclear envelope, with the chromosomes unwound into thin threads.

2. 1.

   Ari sorts four drawings of one dividing animal cell from first to last. Which order is right?

   • Q, R, S, P
   • Q, R, P, S
   • R, Q, P, S
   • Q, P, R, S
3. 2.

   Bo sorts four drawings of one dividing plant cell from first to last. Which order is right?

   • P, R, S, Q
   • R, P, Q, S
   • R, P, S, Q
   • R, S, P, Q

4. Use this

   Four cell drawings of one animal cell with 12 chromosomes (model, not to scale), shown in mixed order. P: two groups of 12 chromosomes unwinding at the ends, new nuclear envelopes forming, a deep groove at the middle. Q: two separate cells side by side, each with one nucleus and thin threads inside. R: 12 X-shaped chromosomes in a row across the middle. S: 24 single rods in two groups of 12, moving apart in a stretched oval cell.

5. 3.

   Esme sorts four drawings of one dividing animal cell from first to last. Which order is right?

   • R, S, Q, P
   • R, P, S, Q
   • S, R, P, Q
   • R, S, P, Q

6. Use the table

   Card (model data): a slide of onion root tip cells, 120 cells counted. The whole cell cycle in an onion root tip takes about 12 hours, and each cell counted stands for an equal share of it.

   Stage	Cells counted
   Interphase	105
   Prophase	8
   Metaphase	2
   Anaphase	1
   Telophase	4

   The card is read about only.

7. 4.

   Jun's class counted cells on a root tip slide and made the card. Which mitosis stage lasts longest, and about how long?

   • Prophase, about 8 hours
   • Anaphase, about 0.1 hours
   • Interphase, about 10.5 hours
   • Prophase, about 0.8 hours
8. 5.

   Kira's class counted cells on another root tip slide. About how many minutes does a cell spend in mitosis, from prophase through telophase?

   • 45 minutes: 5 ÷ 80 × 720 = 45
   • 630 minutes: 70 ÷ 80 × 720 = 630
   • 10 minutes: 10 cells are in mitosis, so 10 minutes
   • 90 minutes: 10 ÷ 80 × 720 = 90
9. 6.

   Luz's group names groups A and B on the card. Which pair of names is right, and which stage is longer?

   • A is anaphase and B is metaphase; A is longer
   • A is metaphase and B is anaphase; A is longer
   • A is metaphase and B is anaphase; B is longer
   • A is prophase and B is telophase; A is longer

10. Notebook (not to scale)

    Notes on one plant cell with 6 chromosomes. Line 1: In prophase, the 6 chromosomes condense and the nuclear envelope breaks down. Line 2: In anaphase, the sister chromatids separate and move to opposite ends. Line 3: Telophase is the same thing as cytokinesis. Line 4: A cell plate grows across the middle and becomes a new wall.

11. 7.

    Pia's notebook describes one dividing plant cell in four lines. Which line has a flaw?

    • Line 2: sister chromatids separate in metaphase, not in anaphase
    • Line 1: the nuclear envelope breaks down in telophase, not in prophase
    • Line 4: plant cells pinch in with a cleavage furrow, not a cell plate
    • Line 3: telophase is about the nuclei, and cytokinesis divides the cytoplasm

12. Claim card

    a human body cell has 46 chromosomes (OpenStax Biology 2e, 10.1). At metaphase each chromosome is made of two sister chromatids joined at a centromere. The claim says the cell has 46 chromosomes and 92 sister chromatids.

13. 8.

    Ren claims that a human body cell at metaphase has 46 chromosomes and 92 sister chromatids. Which verdict and reason are right?

    • Agree: the 92 adds the 46 chromosomes and 46 matching ones from the other parent
    • Agree: each of the 46 chromosomes is two sister chromatids, and 46 × 2 = 92
    • Disagree: each of the 92 chromatids is its own chromosome, so there are 92 chromosomes
    • Disagree: the 46 chromosomes split into 23 pairs of sister chromatids at metaphase
14. 9.

    “Slide card (model data)” Tala looks at a slide with one cell in interphase and one in metaphase, and claims the X-shaped chromosomes are easiest to see in the interphase cell. Which verdict and reason are right?

    • Wrong: chromosomes are clearest in telophase, when they are unwound and thin
    • Wrong: interphase DNA is loose chromatin, and chromosomes are most condensed at metaphase
    • Right: the nuclear envelope holds the chromosomes in X shapes until mitosis ends
    • Right: the chromosomes stay condensed and X-shaped through the whole cell cycle

15. Use this

    Slide card (model data): one plant cell with a cell wall has finished mitosis and holds 2 nuclei, each inside a nuclear envelope. No cell plate forms in the middle.

16. 10.

    Zee sees a plant cell that finished mitosis with 2 nuclei and no cell plate, and claims it is impossible because telophase and cytokinesis are the same event. Which verdict and reason are right?

    • Wrong: the plant cell should already be pinching in with a cleavage furrow
    • Right: after anaphase, the 2 groups of chromosomes join into 1 nucleus
    • Wrong: telophase forms the nuclei, but cytokinesis is separate and may not follow mitosis
    • Right: telophase and cytokinesis are one event, so 2 nuclei mean 2 cells