Mitosis and meiosis compared
Grade 9 Science Worksheet - Challenge Me
Circle the best answer.
Ari follows a model animal with 2n = 6. An egg cell and a sperm cell, each made by meiosis, join. How many chromosomes does the joined cell have?
- 9 chromosomes
- 6 chromosomes
- 12 chromosomes
- 3 chromosomes
Bo reads the model card for a germ cell line. How many cells exist after step 2?
- 12 cells
- 32 cells
- 256 cells
- 16 cells
Read this first
Use this
Sister chromatids in a model cell (model data), 4 rows. Columns: step, what happens. start, 2n = 6, chromosomes copied, so each has 2 sister chromatids. mitosis, sister chromatids separate and each becomes a chromosome. meiosis I, sister chromatids stay joined and the chromosome pairs separate. meiosis II, sister chromatids separate and each becomes a chromosome.
Esme counts the chromatids in each daughter cell of the model cell, after mitosis and after meiosis I. What are the counts?
- 12 after mitosis and 6 after meiosis I
- 6 after mitosis and 3 after meiosis I
- 6 after mitosis and 6 after meiosis I
- 3 after mitosis and 3 after meiosis I
Lab card (model data)
item reading cell line cells that make sperm cells starting cell 2n = 8 divisions 1 cells made 2 chromosomes in each new cell 8 purpose more cells for the line Jun reads the lab card about a cell line that makes sperm cells. Which choice names the division and gives the reason?
- Mitosis, because germ cells also divide to make more germ cells
- Meiosis, because any dividing animal cell in that line uses meiosis
- Meiosis, because the 2 new cells are identical to each other
- Meiosis, because 2 cells were made from the sperm-making line
Chromosome cards (model, no crossing over, not to scale). Luz compares four sets of daughter cards from a parent with 2n = 4. Which set shows the cells from one complete meiosis?
- Set P: 2 cells, each with the full set of cards
- Set Q: 4 cells, each with half the cards
- Set S: 2 cells, each with half the cards
- Set R: 4 cells, each with the full set of cards
Use this
Notebook, mitosis (model data), 4 rows. Columns: line, what was written. 1, The chromosomes are copied before the cell divides. 2, One division makes 2 new cells. 3, Each new cell has 3 chromosomes, half of the parent's 2n = 6. 4, The new cells match the parent cell.
Milo checks a classmate's notebook about mitosis. Which choice finds the mistake and fixes it?
- Line 2: mitosis should make 4 new cells
- Line 1: the chromosomes should be copied after the division
- Line 4: the new cells should differ from the parent
- Line 3: each new cell should have 6 chromosomes
Use this
Notebook, meiosis (model data), 4 rows. Columns: line, what was written. 1, The chromosomes are copied once, before meiosis begins. 2, Two divisions follow in a row. 3, Four cells are made, each with 4 chromosomes, for 2n = 8. 4, The four cells are identical, because the chromosomes were copied exactly.
Noah checks a classmate's notebook about meiosis. Which choice finds the mistake and fixes it?
- Line 1: the chromosomes should be copied twice
- Line 3: each cell should have 8 chromosomes
- Line 4: the four cells differ from each other
- Line 2: meiosis has 1 division
Notebook, strawberry runner (model data)
line what was written 1 A parent strawberry plant sends out a runner 2 Cells of the runner divide by mitosis 3 A new plant grows at a node and matches the parent 4 The new plant began when an egg cell and a sperm cell joined Pia checks a classmate's notebook about a strawberry runner. Which choice finds the mistake and fixes it?
- Line 4: no cells joined; the plant grew from the parent
- Line 3: the new plant should differ from the parent plant
- Line 2: the runner's cells should divide by meiosis, not mitosis
- Line 1: a runner is part of the root, not the stem
Claim card (model data)
claim reason given A skin cell that divides to replace a worn skin cell uses meiosis meiosis is how cells make new cells Tala reads the claim card. Which reply gives the right verdict with the right reason?
- Yes: meiosis keeps the full number, which a skin cell needs
- Yes: meiosis is how any body cell makes new cells for the body
- No: body cells use mitosis, which keeps the full number
- No: skin cells use mitosis, which halves the chromosome number
Zee reads the claim card. Which reply gives the right verdict with the right reason?
- Yes: mitosis shuffles the genes in each new cell of the runner
- No: mitosis copies exactly, but meiosis and joining mix chromosomes
- Yes: plants from two parents match each other more
- No: runner plants form by meiosis, so they are identical to each other