CHAPTER
9 Cell Division
IN THIS CHAPTER
Summary:This chapter teaches you what you need to know about cell divi-
sion in prokaryotes (binary fission), the cell cycle, and cell division in eukary-
otes (mitosis and meiosis). In addition, it discusses the life cycles of various
organisms.Key Ideas
✪There are four main stages in the cell cycle—G 1 , S, G 2 , and M.
✪The stages of mitosis are: prophase, metaphase, anaphase, telophase, and
cytokinesis.
✪Crossing over occurs during prophase I of meiosis.
✪Examples of cell division control mechanisms: growth factors, checkpoints,
density-dependent inhibition, and cyclins/protein kinases.
✪Sources of cell variation: crossover, 2npossible gametes, and random
pairing of gametes.Introduction
Cell division, the process by which cells produce more of their kind, can occur in several
ways. In this chapter, we discuss cell division in prokaryotes (binary fission), the cell cycle,
and cell division in eukaryotes (mitosis and meiosis). After comparing mitosis and meiosis,
we will touch on the life cycles of various organisms.86 ❯
KEY IDEA