Transcript The Cell Cycle2

The Cell Cycle
The Three Stages of the Cell Cycle
 Stage 1: Interphase
 Stage 2: Mitosis
 Stage 3: Cytokinesis
Stage 1: Interphase
 Growth: The cell doubles in size and
produces all structures needed to carry out
the life processes.
 DNA Replication: The cell makes a copy of
its DNA.
 Preparation for Division: The cell makes
structures it will use to divide during the rest
of the cell cycle.
Stage 2: Mitosis
 Mitosis is the stage of the cell cycle during
which the nucleus of the cell divides into two
nuclei.
 Each copy of the DNA is distributed to the
daughter cells.
Stage 2: Mitosis
Phase 1: Prophase
 The chromatin condense and coil to form
chromosomes.
 Spindle fibers form a bridge at the ends of
the cell.
 The nuclear membrane breaks down and
disappears.
Stage 2: Mitosis
Phase 2: Metaphase
 The chromosomes line up across the center
of the cell.
 Each chromosome is attached by its
centromere to a spindle fiber.
Stage 2: Mitosis
Phase 3: Anaphase
 The centromeres split and one chromatid
moves along the spindle fiber to one end of
the cell. The other chromatid moves along
the spindle fiber to the other end of the cell.
 The cell becomes stretched out.
Stage 2: Mitosis
Phase 4: Telophase
 The chromosomes stretch and lose their rod
like appearance.
 The nuclear membrane forms around each
of the sets of chromosomes
Stage 3: Cytokinesis
 The DNA and organelles are distributed to
each of the new daughter cells.
 The cytoplasm divides to form two separate
daughter cells.
Stage3 : Cytokinesis
 In animal cells, the cytoplasm pinches in
around the middle of the cell. Eventually the
cell divides in two.
 In plant cells, a cell plate forms across the
middle of the cell. The cell plates develop
into a new cell membrane. The cell wall
forms around the cell membrane.
The End