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Introduction to the lesson
In chapter one, you learned about the cell theory which states that "the basic unit of structure and function of all living organisms is the cell". The cell theory also includes Virchow's theory that "all cells arise from pre-existing cells by cell division". In this chapter you will study the process of cell division in detail and learn how exactly all cells can arise from pre-existing cells. There are two forms of cell division: meiosis and mitosis. Meiosis is a specialized form of cell division in which the chromosome number is halved. It only occurs during sexual reproduction. In this chapter, we will focus on mitosis which is the more common form of cell division. The purpose of this lesson is to give you a general introduction to what you will be learning in the next few lessons.
Preparing for the chapter
- How do you think a living organism grows?
- Why do you think it is important for the cell to replicate itself?
- Why is it important for the nucleus to replicate itself?
- What do you think are the different stages of a cell?
- What do you think will happen if something goes wrong in cell replication?
First reading of the chapter:
Skim through the chapter quickly (as explained in chapter one)
Second reading of the chapter
Now read the chapter (p.94-106). It is not necessary to take notes as you will work through each section in detail in the following lessons.
Closing
As you end this lesson, ask yourself
- What new things have I learned today?
- What did I already know?
- What still confuses me?
NOTE: This chapter covers section 5 of the Cambridge International AS Biology (9700) syllabus 2016-2018 (p.23).