Download cell cycle - Life Science

The Cell Cycle
Cell Division
Cell Division
• A cells must divide to make more cells.
The Cell Cycle
The cell cycle is how cells
grow and divide.
3 parts
Interphase
(Growth)
Mitosis
(Division)
Cytokinesis
(Cell Splits)
Interphase
makes up most of the cell
cycle & takes the longest!
Stage 1: Interphase
• Interphase is the growth stage
1.
2.
3.
Cell Grows
Genetic material is copied
Prepares for division
Review
What is the longest stage of the cell cycle?
a. Metaphase
b. Interphase
c. Chromophase
d. Mitosis
The Genetic Material
• All genetic material is found in the nucleus
• The genetic material is called DNA
• DNA is contained in thread-like structures called
Chromosomes
The Genetic Material
• After Chromosomes tighten up they are
called Chromatids
• They are held together by the centromere
Stage 2: Mitosis
• Mitosis is when the cell nucleus divides
into two identical nuclei.
• New cells are produced for growth & repair
• New cells are identical to the parent cells
Stages of Mitosis
1. Prophase
2. Metaphase
3. Anaphase
4. Telophase
PMAT
Review
The stage of the cell cycle in which the
nucleus divides is known as:
a. Interphase
b. Mitosis
c. Cytokinesis
d. Prophase
Stage 1: Prophase
•
•
•
•
Chromosomes form pairs
The centrioles are moving to the poles (ends)
Spindle fibers develop
The nuclear membrane is breaking down.
Stage 2: Metaphase.
• The chromatids line up in the middle of the cell
• They attach to the spindle fibers
Stage 3: Anaphase
• The chromosomes are pulled apart
• They move to the opposite side of the cell.
Stage 4: Telophase
• The Spindle fibers break apart
• A new nuclear membrane forms
• Two identical nuclei exist.
Review
Which lists the phases of mitosis in order?
a. prophase, metaphase, anaphase, telophase
b. telophase, anaphase, metaphase, prophase
c. metaphase, anaphase, prophase, telophase
d. anaphase, prophase, metaphase, telophase
Stage 3:Cytokinesis
• The cytoplasm separates
• Left with two identical cells
Cytokinesis
• This is the end of the cell cycle
• Each new daughter cell has the same
number of chromosomes as the parent cell!
Summary
• Mitosis starts with one cell
• It ends with two identical cells
• Cells have the same number of chromosomes
• 3 Stages of Cell Cycle:
1. Interphase
2. Mitosis (Prophase, Metaphase, Anaphase, Telophase)
3. Cytokinesis
Mitosis Video
Make a Cell Cycle Flipbook
Stage
Interphase
Prophase
Metaphase
Anaphase
Telophase
Cytokinesis
What happens to
chromosomes?
What happens in
cell?
Picture