How one cell becomes two (mitosis)

Grade 7 Science Worksheet - Building Confidence

Circle the best answer.

1. Read this first

   Use this

   Row of cards for one dividing model animal cell, not to scale (model data: 4 chromosomes). Card P: a group of 4 chromosomes sits at each end, and each group has a new nucleus boundary around it. Card Q: the 4 chromosomes sit in a line across the middle of the cell. Card R: the copies of each chromosome are pulled into two groups, with 4 moving toward each end. Word bank: prophase, metaphase, anaphase, telophase, cytokinesis.

2. 1.

   Bo studies a row of cards showing one dividing animal cell. Which stage does card R show?

   • Anaphase
   • Prophase
   • Telophase
   • Metaphase

3. Use this

   Row of cards for one dividing model plant cell, not to scale (model data: 4 chromosomes). Card P: the 4 chromosomes sit in a line across the middle of the cell. Card Q: the copies of each chromosome are pulled into two groups, with 4 moving toward each end. Card R: a group of 4 chromosomes sits at each end, and each group has a new nucleus boundary around it. Word bank: prophase, metaphase, anaphase, telophase, cytokinesis.

4. 2.

   Esme studies a row of cards showing one dividing plant cell. Which stage does card R show?

   • Cytokinesis
   • Anaphase
   • Prophase
   • Telophase

5. Use this

   Row of cards for one dividing model plant cell, not to scale (model data: 4 chromosomes). Card P: the 4 chromosomes are short, thick rods, and the boundary around the nucleus is breaking up. Card Q: the 4 chromosomes sit in a line across the middle of the cell. Job column (what happens in this stage): P | The chromosomes thicken and the nucleus boundary starts to break up; Q | blank.

6. 3.

   Jun fills in a job column for two cards of a dividing plant cell. What belongs in the blank row for card Q?

   • The chromosomes line up across the middle of the cell
   • The cell grows and copies its chromosomes
   • The copies of each chromosome are pulled toward opposite ends
   • A new nucleus boundary forms around each group of chromosomes
7. 4.

   Row of cards for one dividing model animal cell, not to scale (model data: 4 chromosomes). Kira fills in a job column for two cards of a dividing animal cell. What belongs in the blank row for card Q?

   • The cytoplasm divides and one cell becomes two cells
   • The chromosomes thicken and the nucleus boundary starts to break up
   • The chromosomes line up across the middle of the cell
   • The copies of each chromosome are pulled toward opposite ends

8. Use this

   Row of cards for one dividing model plant cell, not to scale (model data: 4 chromosomes). Card P: the copies of each chromosome are pulled into two groups, with 4 moving toward each end. Card Q: a new wall is forming across the middle of the cell, making two cells, and each has its own nucleus.

9. 5.

   Luz fills in a job column for two cards of a dividing plant cell. What belongs in the blank row for card Q?

   • The cell pinches in the middle until it splits in two
   • The chromosomes line up across the middle of the cell
   • A new wall forms across the middle and one cell becomes two cells
   • The cell grows and copies its chromosomes
10. 6.

    Interphase. Back: blank. Four meanings are listed in the choices. Milo makes a flash card for the word interphase. Which meaning belongs on the back?

    • A resting time before mitosis, when the cell stops its work
    • The last step of a division, when the cytoplasm splits in two
    • The first stage of mitosis, when the chromosomes first become visible
    • The time between divisions, when the cell grows and copies its chromosomes
11. 7.

    The first stage of mitosis. Back: blank. Four stage names are listed in the choices. Pia lists the stages of mitosis in order for a flash card. Which stage comes first?

    • Metaphase
    • Prophase
    • Anaphase
    • Interphase
12. 8.

    Ren follows a model cell with 8 chromosomes through mitosis and cytokinesis. How many chromosomes are in each new cell?

    • 6
    • 4
    • 8
    • 16
13. 9.

    One card of a dividing model animal cell, not to scale (model data: 6 chromosomes). Tala reads card S of a dividing model animal cell. How many chromosomes will each new cell have?

    • 9
    • 3
    • 12
    • 6
14. 10.

    One card of a model animal cell before it divides, not to scale (model data: 4 chromosomes). Zee reads that a model cell with 4 chromosomes divides by mitosis. Which result should Zee expect?

    • 4 cells with 4 chromosomes each
    • 2 cells with 2 chromosomes each
    • 2 cells with 4 chromosomes each
    • 2 cells with 8 chromosomes each