Unit 4: Continuity and Change
Topic 4.4: Cell and Nuclear Division Questions
Practice 20 exam-style questions for IB Biology Topic 4.4. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1Identify1 mark
During which stage of interphase is the DNA replicated?
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When chromosomes are being classified to build a karyotype, which of the following is a valid criterion used to sort and pair them?
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State the name given to the structure that forms across the middle of a dividing plant cell and grows outwards to separate the two daughter cells.
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A complete karyogram of a body cell from a female gorilla shows every chromosome arranged in 24 matching pairs.
What is the total diploid chromosome number shown?
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State one criterion used to classify and pair the chromosomes when building a karyotype.
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State what happens to the homologous chromosomes during the first division of meiosis (meiosis I).
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What happens to the chromosomes during the first division of meiosis (meiosis I)?
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A micrograph of an onion root-tip cell shows the chromosomes lined up single file along the middle of the cell.
Which phase of mitosis is this?
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During which phase of mitosis are the sister chromatids pulled apart to opposite poles of the cell?
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State the name of the stage of interphase during which the DNA is replicated.
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What is the main activity of the cell during G1 phase?
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State the phase of mitosis in which the sister chromatids are pulled apart to opposite poles of the cell.
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2026
Draw a pair of homologous chromosomes as they appear in a karyogram.
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Meiosis is described as a reduction division.
What does this mean?
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Which three stages, in order, make up interphase?
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What is the correct order of the four phases of mitosis?
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Which event takes place in BOTH mitosis and meiosis?
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A student counts 320 cells in an onion root-tip field of view.
Of these, 272 cells are in interphase and the rest are in a stage of mitosis.
Calculate the mitotic index of this sample, showing your working.
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A human karyogram shows 47 chromosomes, with three copies of chromosome 18 instead of the usual pair.
Which event in meiosis explains this karyogram?
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