The cell cycle
Chapter 6
Ask your neighbor. . .
• Why do cells divide? What does this mean?
• What do ALL cells have (that non-living things
do not)?
Cell division:
The big picture
The eukaryotic cell cycle
The cell cycle in words. . .
• Interphase
– G1
–S
– G2
• Mitotic phase
– prophase
– metaphase
– anaphase
– telophase & cytokinesis
Interphase
Mitotic phase
•
•
•
•
prophase
metaphase
anaphase
telophase & cytokinesis
Prophase
Metaphase
Anaphase
Telophase & cytokinesis
Cytokinesis in
animal cells
Cytokinesis in
plant cells
•
•
•
•
•
Interphase
Prophase
Metaphase
Anaphase
Telophase & cytokinesis
• How are the daughter cells produced after cell
division genetically related to each other?
Homologous chromosomes
So, how many chromosomes are there in
a cell? It depends. . .
Let’s review so far. . .
• How many parent cells?
• How many daughter cells?
• How many times did the DNA replicate before
division?
• How many mitotic divisions are there in each
cycle?
• How many chromosomes in daughter cells?
• How are the daughter cells related to each
other? Why?
• How are the daughter cells related to the parent
cell? Why is this important?
• What is a sister chromatid? How are they
related?
• What are homologous chromosomes? Where
do they come from?
• What does diploid mean? What cells in
humans are diploid?
• What does haploid mean? What cells in
humans are haploid?
Quick mitosis summary
• Purpose
• Process
• Products
Reproduction by mitosis (asexually)
• Advantages
• Disadvantages
Influences on cell division
• Chemical factors
• Physical factors
Chemical factors
• Growth factors
Cell cycle control system
Physical factors
• Density-dependent
inhibition
• Anchorage dependence
What happens when the cell cycle
malfunctions?
Cancer cells are not normal
Programmed cell death
• Called apoptosis
Then what happens?