Transcript Cell Cycle and Mitosis

Cell Cycle and Mitosis
Key Concepts and
Vocabulary
Key Concepts:
1. What is the cell cycle?
2. What happens in
interphase?
3. What are the stages
of mitosis?
4. How does mitosis
differ in plants and
animals?
Key Vocabulary:
Interphase
Mitosis
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
The Cell Cycle
The phases in the life a
cell
Two major phases:
1. Interphase
2. Cell Division
Interphase is the…
• Period between cell
divisions
• Longest phase of the
cell cycle
What happens during
interphase?
Phases of Interphase
• G1 – “Growth” – proteins
made to prepare for
replication
• S – DNA REPLICATED
“synthesis”
• G2 – “Getting Ready” for
Cell division
Mitosis
• Division of the cell nucleus that produces two
genetically identical cells
• Helps create new diploid body cells
How many chromosomes do diploid cells have in
humans?
What kind of cells go through mitosis?
Mitosis
Mitosis consists of 4 phases:
1.
2.
3.
4.
In Prophase
1. Chromosomes form
2. Nucleus begins to
disappear
3. In animal cells, centrioles
form
In Metaphase
1. Chromosomes line up in
the center of the cell
2. Chromosomes attached to
the spindle fibers
In Anaphase
1. Chromosomes (sister
chromatids) are pulled
apart to each end of the
cell by the spindle fibers
In Telophase
1. Chromosomes reach the
ends of the cell
2. Two nuclei begin to form
around each set of
chromosomes
3. The cells begin to pinch in
half
In Cytokinesis
1. Cytoplasm of the dividing
cell is separated
2. Ends the process of cell
division
3. Results in two separate
cells
Cytokinesis in Plants
• Plant cells can not pinch
in to form a cleavage
furrow – why?
• Plant cells form a
cell plate to separate new
cells
Cytokinesis in Animals in
Plants
Find and Label the Stages of Mitosis
Find and Label the Stages of
Mitosis
Abnormal Cell Division
• Cell division is regulated by the cells’ genes
• If mutations occur, uncontrolled cell division
occurs – forming a tumor
• Cancer is caused by the formation of
malignant tumors
• Malignant tumors spread in the body
causing damage