Grades 9–10
Hard
Official
Biology: Cell Division: Challenge
Free high school biology practice on cell division. Study the cell cycle, mitosis phases, meiosis, and how division produces growth, repair, and genetic diversity. Stretch thinking with multi-step problems, application questions, and deeper reasoning.
For teachers
Assign after modeling mitosis with diagrams or before a lab on onion root tip slides.
Learning support
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Study guide
# Hard Level Guide
Stretch thinking with multi-step problems, application questions, and deeper reasoning.
# 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.