High school (9–12)
Science
Biology: Cell Division: Standard Practice
Free high school biology practice on cell division. Study the cell cycle, mitosis phases, meiosis, and how division produces growth, repair, and genetic diversity. Grade-level practice aligned to typical classroom expectations and unit assessments.
Medium Level Guide
Grade-level practice aligned to typical classroom expectations and unit assessments.
The Cell Cycle
Interphase (G1, S, G2) is when the cell grows and DNA replicates. M phase includes mitosis and cytokinesis. Checkpoints control progression. Cancer often results from uncontrolled cell division when checkpoints fail.
Mitosis
Mitosis produces two genetically identical diploid daughter cells for growth and repair. Phases: prophase (chromosomes condense), metaphase (chromosomes align), anaphase (sister chromatids separate), telophase (nuclei reform). Cytokinesis splits the cytoplasm.
Meiosis
Meiosis produces four genetically unique haploid gametes for sexual reproduction. Two divisions (meiosis I and II) reduce chromosome number by half. Crossing over in prophase I increases genetic variation.
Comparing Mitosis and Meiosis
Mitosis: one division, identical cells, diploid to diploid. Meiosis: two divisions, varied cells, diploid to haploid. Nondisjunction during either process can cause chromosome disorders.
FAQ
- Are mitosis phase names tested?
- Yes. Sample questions cover phase order and what happens in each stage.
- Does this include cancer biology?
- The cell cycle section introduces checkpoints and uncontrolled division as a connection to cancer.