Transcript The Cell Cycle - Chaparral Middle School

The Cell Cycle
The Life of a Cell
Cells pass through different stages in their
lives
 These stages = Cell Cycle
 Begins when cell forms, and ends when
cell divides
 Before division, has to copy its DNA

Prokaryotic or Eukaryotic?



Prokaryotic cells:
simple! No membrane
covered organelles,
small circle of DNA.
Split into 2 parts =
Binary fission
Each new cells
contains 1 copy of the
DNA
Eukaryotic cells
More complex; more DNA
 DNA is in chromosome pairs =
homologous chromosomes
 Humans have 23 pairs, or 46 total

What do chromosome pairs
look like?
The Cell Cycle
Phases of the Cell Cycle


IPMAT
Interphase: Cell grows (G1 and G2), and copies
its DNA (S = synthesis)
A Cell’s Life

Interphase

Mitosis




Prophase
Metaphase
Anaphase
Telophase
Phases of Mitosis




Prophase: PREPARATION phase; DNA twists
into chromosomes, nuclear membrane breaks
down
Metaphase: Chromosomes MEET in the
MIDDLE of the cell
Anaphase: Chromosomes separate and move
APART
Telophase: The cell TEARS into two
Prophase

Chromosomes starting to form, nuclear
membrane starts to break apart
Metaphase
Hint: Think of this as the meta or (middle) phase where
chromosomes line up in the middle of the cell.
Anaphase
Hint: This is
were the 2
sisters Ana
and Ana are
pulled apart
to different
ends of the
cell…so sad.
Telophase
Hint: Now
the sisters
are far apart
and starting
separate
lives. They
have to call
each other
by
TELOphone.
Cytokinesis
At the end of Telophase the cell membrane pinches into two
identical cells.
Animal Cell
Plant Cell
In plant cells a cell plate
forms and later becomes
the cell membrane.
QUIZ
The cell cycle is the cell’s what?
Life cycle
2. What two main stages make up the cell cycle?
Interphase and Mitosis
3. What happens during Interphase?
During interphase the cell grows and copies its
DNA.
1.
4. Mitosis is all about a cell doing what?
Mitosis is all about cells dividing in half and
making sure each new cell has the exact same
DNA as the parent cell.
QUIZ CONT.
5.
5.
5.
In what phase of Mitosis do the
chromosomes line up in the center of the
cell?
Metaphase
In what phase of Mitosis do the spindle
fibers first pull the chromosomes apart?
Anaphase
In what phase of the Mitosis do
chromosomes start to form?
Prophase