The Process of Cell Division

1
The Process of Cell Division
2
Learning Objectives

• Describe the role of chromosomes in cell
  division.
• Name the main events of the cell cycle.
• Describe what happens during the four stages of
  mitosis.
• Describe the process of cytokinesis.

3
Chromosomes

• In prokaryotic cells, DNA is packaged into a
  single, circular chromosome.

4
Chromosomes

• In eukaryotic cells, DNA is packaged into
  multiple chromosomes.

DNA double helix
duplicated chromosome
coils
centromere
sister chromatids
nucleosome
supercoils
histone proteins
5
Prokaryotic Cell Cycle

• Prokaryotes undergo binary fission.

6
Eukaryotic Cell Cycle

• Eukaryotic cells have a more complex cell cycle
  than prokaryotic cells.

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Which Cell Cycle?
bacteria
plants
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M Phase

• Cell division occurs during M phase.

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Prophase

• The nucleus condenses and chromosomes become
  visible. The spindle begins to form.

10
Metaphase

• Chromosomes line up at the center of the cell.

centrioles
chromatid
centromere
chromosome
11
Anaphase

• Chromosomes move toward opposite poles.

individual chromosomes
12
Telophase

• The cell begins to divide into daughter cells.

nuclear envelopes re-forming
13
Cytokinesis
Cytoplasm

• pinches in the center to form
  two daughter cells.

14
Mitosis Overview

• List and describe the stages of mitosis.

Interphase
Cytokinesis
Prophase
1
Telophase
4
Metaphase
2
3
Anaphase
15
Student Worksheet Answers