The Cell Cycle
Science 9 Lesson #6
Learning objective
To be able to describe, in
sequence, the stages and features
of the cell cycle, including mitosis
and cytokinesis
Cell division is composed of two
processes: mitosis and cytokinesis.
Mitosis is the process that divides
the nuclear material. Cytokinesis is
the process that divides the
cytoplasm and the rest of the
organelles in half.
Mitosis and Cytokinesis
Interphase
• Cell carries out ‘normal’ functions
• Also…
–Growth
–DNA Replication
–Preparation for cell division
Prophase
• Chromosomes form X-shape with
sister chromatids
• Nucleolus disappears
• Spindle fibers attach at centromeres
stretched across cell by centrioles
• Nuclear membrane disappears
Metaphase
• Spindle fibers pull the
chromosomes into a line across
the equator
Anaphase
• Spindle fibers pull sister
chromatids apart and move to
opposite poles of the cell
Telophase
• Spindle fibers disappear
• Nuclear membranes form around
each set of chromosomes
• Nucleolus appears in each
nucleus
Cytokinesis
Animal Cell:
• Cell membrane pinches and divides organelles
and cytoplasm
Plant cell
• Cell plate forms along the center line
• Organelles and cytoplasm are divided
Mitosis assignment
1. Complete the handout on mitosis
2. Choose one…
A. Make a cell cycle poster (including
mitosis in full detail)
Worksheet Answers: ‘getting to know
the cell cycle’
1.
2.
3.
4.
5.
6.
7.
8.
9.
Three
Interphase, DNA
Mitosis
Cytokinesis, two
Four
Prophase, nucleolus
Metaphase, duplicated chromosomes
Anaphase, duplicated chromosomes
Telophase, nucleolus
Worksheet answers:
‘The cell cycle and mitosis’
1. E
2. F
3. A
4. D
5. B
6. A
1. A
2. B
3. C
4. A
5. D