Views
Downloads
Printable Cell Cycle & Mitosis Worksheet | Grade 9 Biology
Paste this activity's link or code into your existing LMS (Google Classroom, Canvas, Teams, Schoology, Moodle, etc.).
Students can open and work on the activity right away, with no student login required.
You'll still be able to track student progress and results from your teacher account.
This Grade 9 Biology worksheet helps students describe the cell cycle, count chromosomes and chromatids correctly, and use mitotic index data to support claims. Twelve tasks move from recall to evidence-based evaluation, so students practice explaining how cell division connects to growth.
At a Glance
- Grade: 9 · Subject: Biology
- Standard: Not specified — students count chromosomes, calculate mitotic index, and judge claims using data.
- Skill Focus: Chromosome counting, mitotic index, data-based claims
- Format: 5 pages · 12 problems · Answer key included · PDF
- Best For: Unit review or formative checkpoint
- Time: 40–50 minutes
What's Inside
The worksheet has three parts across 5 pages: multiple-choice and short-answer recall, a chromosome and chromatid table, and three synthetic root-tip data tables. A conventions box defines counting rules, mitotic index, and rounding. A 3-page answer key shows worked results.
Skill Progression
- Guided practice (Part A, 3 tasks): recall S phase and anaphase, then compare parent and daughter cells.
- Supported practice (Part B, 6 tasks): complete the chromosome table, estimate phase time, and calculate mitotic index using the conventions box.
- Independent practice (Part C, 3 tasks): estimate cycle length and evaluate two student claims by citing data.
The sequence follows gradual release: I Do, We Do, You Do.
Standards Alignment
No standard code is listed for this worksheet. It addresses high school biology expectations for modeling the cell cycle, explaining mitosis as the basis of growth, and supporting claims with evidence. Teachers can map these skills to their own state or district biology standards.
How to Use It
- After direct instruction: assign Parts A and B as classwork once students have seen the phases of mitosis.
- Before a unit test: use Part C as a review set, in pairs or independently.
While students work, watch whether they count centromeres rather than chromatids in the table. Expect 40–50 minutes in total.
Who It's For
Grade 9 Biology students who have met interphase and mitosis. Students who need support can start with Parts A and B and use the conventions box as a reference. Pair it with a labeled mitosis diagram or an onion root-tip micrograph.
The Cell-Cycle Check worksheet for Grade 9 Biology teaches students to describe the cell cycle, count chromosomes and chromatids by centromeres, calculate mitotic index, and evaluate claims using synthetic root-tip data. Its 12 tasks over 5 pages move from recall of S phase and anaphase to multi-step reasoning with three data tables, ending with two claim-evaluation items that require students to cite numbers as evidence. The sequence follows the gradual release model described by Fisher & Frey (2014), in which teachers shift responsibility from modeled instruction to guided and then independent work. A 3-page answer key supports quick scoring and error analysis. Because all data are invented, the worksheet can be used at any point in a cell cycle and mitosis unit without overlapping lab results. It suits review, homework, or formative assessment in high school biology classes.
