Warm-Up (11/7)
Explain the importance of
DNA replication.
Last Tuesday’s Picture
UNIT
3B
The Cell Cycle
UNIT
3C
UNIT
The Cell Cycle
3C
The cell cycle produces
an identical daughter
cell.
original plus a
“daughter” cell
original cell
UNIT
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
Most cells are constantly
in the cell cycle.
3C
Hair follicle cells, for example.
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
UNIT
3C
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
Mitosis follows
interphase to separate
the DNA into two cells.
UNIT
3C
UNIT
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
3C
5 phases of mitosis:
• Nucleus breaks down and DNA condenses into
chromosomes (prophase).
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
Mitosis follows
interphase to separate
the DNA into two cells.
PRO
UNIT
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
3C
5 phases of mitosis:
• Nucleus breaks down and DNA condenses into
chromosomes (prophase).
• Chromosomes line up in the middle (metaphase).
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
Mitosis follows
interphase to separate
the DNA into two cells.
PRO
META
UNIT
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
Mitosis follows
interphase to separate
the DNA into two cells.
3C
5 phases of mitosis:
• Nucleus breaks down and DNA condenses into
chromosomes (prophase).
• Chromosomes line up in the middle (metaphase).
• Chromosomes pull apart (anaphase).
PRO
META
ANA
UNIT
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
Mitosis follows
interphase to separate
the DNA into two cells.
3C
5 phases of mitosis:
• Nucleus breaks down and DNA condenses into
chromosomes (prophase).
• Chromosomes line up in the middle (metaphase).
• Chromosomes pull apart (anaphase).
• Nuclei reform (telophase).
PRO
META
ANA
TELO
UNIT
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
Mitosis follows
interphase to separate
the DNA into two cells.
3C
5 phases of mitosis:
• Nucleus breaks down and DNA condenses into
chromosomes (prophase).
• Chromosomes line up in the middle (metaphase).
• Chromosomes pull apart (anaphase).
• Nuclei reform (telophase).
• Cells physically pinch apart from each other
(cytokinesis).
CYTO
PRO
META
ANA
TELO
UNIT
The Cell Cycle
The cell cycle produces
an identical daughter
cell.
Most cells are constantly
in the cell cycle.
Interphase is the longest
stage, consisting of:
• Growth (G1)
• DNA replication (S)
• Preparation for
mitosis (G2)
3C
5 phases of mitosis:
• Nucleus breaks down and DNA condenses into
chromosomes (prophase).
• Chromosomes line up in the middle (metaphase).
• Chromosomes pull apart (anaphase).
• Nuclei reform (telophase).
• Cells physically pinch apart from each other
(cytokinesis).
CYTO
PRO
META
ANA
TELO
Mitosis follows
interphase to separate
the DNA into two cells.
P M A T, C!
UNIT
The Cell Cycle
3C
In summary…
4n
2n
4n
2n
2n
Guided Practice
UNIT
3C
• Draw a graph of a cell dividing over four
generations and label growth, synthesis and
preparation stages of interphase; mitosis; and
cytokinesis (LO 3.8)
• Draw a graph of a cell dividing over time
with an increased cell cycle rate or decreased
cell cycle rate (LO 3.7)
UNIT
CTQ #1
3C
Describe how a graph of DNA levels per cell would
look over four generations. (LO 3.8)
CTQ #2
Predict the amount of DNA present in a
cell after 3 cycles of the cell cycle if it lost
the ability to undergo cytokinesis. (LO 3.7)
Closure
Epithelial skin cells are some of the
fastest-dividing cells in the human body,
which means that they complete and reenter the cell cycle more quickly than
most other cell types. Predict what
would happen if a person was scratched
on the arm, killing approximately 10,000
cells from the surface of that person’s
skin, and justify your answer. (LO 3.7)