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1.6 Cell division

IB Syllabus Statements

Understandings:

  • Mitosis is division of the nucleus into two genetically identical daughter nuclei.

  • Chromosomes condense by supercoiling during mitosis.

  • Cytokinesis occurs after mitosis and is different in plant and animal cells.

  • Interphase is a very active phase of the cell cycle with many processes occurring in the nucleus and cytoplasm.

  • Cyclins are involved in the control of the cell cycle.

  • Mutagens, oncogenes and metastasis are involved in the development of primary and secondary tumours.

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Applications and skills:

  • Application: The correlation between smoking and incidence of cancers.

  • Skill: Identification of phases of mitosis in cells viewed with a microscope or in a micrograph.

  • Skill: Determination of a mitotic index from a micrograph.

Videos

Mitosis

Mitosis Extras and Cytokinesis

Cell Cycle

Cyclins, tumors, and smoking

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Topic 1.6 Cell division SSaQ (Syllabus Statement as Questions)

  • What role does serendipity have in science? Give an example of a relevant discovery.

  • Explain how mitosis produces two genetically identical daughter nuclei. Include the sequence and events of the four phases of mitosis.

  • What is meant by supercoiling?

  • What is the difference between cytokinesis in plants and animals?

  • Why is interphase considered an active phase of the cell cycle. Outline the events that happen during interphase.

  • Explain the role of cyclins.

  • Explain the relationship between mutagens, oncogenes, and metastasis.

  • Outline the correlation between smoking and the incidence of cancer.

  • Explain how you would use visual cues to identify the phases of mitosis in cell viewed with a microscope or in a micrograph.

  • Explain how to determine a mitotic index from a micrograph.

  • Explain the difference between the term chromosome and chromatid and when they should be used.

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